diff --git a/public/js/components/claude-config.js b/public/js/components/claude-config.js
index d240ab0..af5bb00 100644
--- a/public/js/components/claude-config.js
+++ b/public/js/components/claude-config.js
@@ -9,6 +9,7 @@ window.Components.claudeConfig = () => ({
     configPath: '', // Dynamic path from backend
     models: [],
     loading: false,
+    restoring: false,
     gemini1mSuffix: false,
 
     // Model fields that may contain Gemini model names
@@ -141,5 +142,27 @@ window.Components.claudeConfig = () => ({
         } finally {
             this.loading = false;
         }
+    },
+
+    async restoreDefaultClaudeConfig() {
+        this.restoring = true;
+        const password = Alpine.store('global').webuiPassword;
+        try {
+            const { response, newPassword } = await window.utils.request('/api/claude/config/restore', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' }
+            }, password);
+            if (newPassword) Alpine.store('global').webuiPassword = newPassword;
+
+            if (!response.ok) throw new Error(`HTTP ${response.status}`);
+            Alpine.store('global').showToast(Alpine.store('global').t('claudeConfigRestored'), 'success');
+
+            // Reload the config to reflect the changes
+            await this.fetchConfig();
+        } catch (e) {
+            Alpine.store('global').showToast(Alpine.store('global').t('restoreConfigFailed') + ': ' + e.message, 'error');
+        } finally {
+            this.restoring = false;
+        }
     }
 });
diff --git a/public/js/store.js b/public/js/store.js
index e8727ce..2cfef80 100644
--- a/public/js/store.js
+++ b/public/js/store.js
@@ -157,7 +157,10 @@ document.addEventListener('alpine:init', () => {
                 accountsReloaded: "Accounts reloaded",
                 reloadFailed: "Reload failed",
                 claudeConfigSaved: "Claude configuration saved",
+                claudeConfigRestored: "Claude CLI restored to defaults",
                 saveConfigFailed: "Failed to save configuration",
+                restoreConfigFailed: "Failed to restore configuration",
+                restoreDefault: "Restore Default",
                 claudeActive: "Claude Active",
                 claudeEmpty: "Claude Empty",
                 geminiActive: "Gemini Active",
@@ -406,7 +409,10 @@ document.addEventListener('alpine:init', () => {
                 accountsReloaded: "账号配置已重载",
                 reloadFailed: "重载失败",
                 claudeConfigSaved: "Claude 配置已保存",
+                claudeConfigRestored: "Claude CLI 已恢复默认设置",
                 saveConfigFailed: "保存配置失败",
+                restoreConfigFailed: "恢复配置失败",
+                restoreDefault: "恢复默认",
                 claudeActive: "Claude 活跃",
                 claudeEmpty: "Claude 耗尽",
                 geminiActive: "Gemini 活跃",
diff --git a/public/views/settings.html b/public/views/settings.html
index 1d1e844..180f419 100644
--- a/public/views/settings.html
+++ b/public/views/settings.html
@@ -523,7 +523,16 @@
                     </div>
                 </div>
 
-                <div class="flex justify-end pt-2">
+                <div class="flex justify-end pt-2 gap-3">
+                    <button class="btn btn-sm btn-ghost border border-space-border/50 hover:border-red-500/30 hover:bg-red-500/5 text-gray-400 hover:text-red-400 px-6 gap-2"
+                        @click="restoreDefaultClaudeConfig" :disabled="restoring">
+                        <svg x-show="!restoring" class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
+                                d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15" />
+                        </svg>
+                        <span x-show="!restoring" x-text="$store.global.t('restoreDefault')">Restore Default</span>
+                        <span x-show="restoring" class="loading loading-spinner loading-xs"></span>
+                    </button>
                     <button class="btn btn-sm bg-neon-purple hover:bg-purple-600 border-none text-white px-6 gap-2"
                         @click="saveClaudeConfig" :disabled="loading">
                         <svg x-show="!loading" class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
diff --git a/src/utils/claude-config.js b/src/utils/claude-config.js
index f7986e2..d4e0743 100644
--- a/src/utils/claude-config.js
+++ b/src/utils/claude-config.js
@@ -83,6 +83,35 @@ export async function updateClaudeConfig(updates) {
     }
 }
 
+/**
+ * Replace the global Claude CLI configuration entirely
+ * Unlike updateClaudeConfig, this replaces the config instead of merging.
+ *
+ * @param {Object} config - The new configuration to write
+ * @returns {Promise<Object>} The written configuration
+ */
+export async function replaceClaudeConfig(config) {
+    const configPath = getClaudeConfigPath();
+
+    // 1. Ensure .claude directory exists
+    const configDir = path.dirname(configPath);
+    try {
+        await fs.mkdir(configDir, { recursive: true });
+    } catch (error) {
+        // Ignore if exists
+    }
+
+    // 2. Write config directly (no merge)
+    try {
+        await fs.writeFile(configPath, JSON.stringify(config, null, 2), 'utf8');
+        logger.info(`[ClaudeConfig] Replaced config at ${configPath}`);
+        return config;
+    } catch (error) {
+        logger.error(`[ClaudeConfig] Failed to write config:`, error.message);
+        throw error;
+    }
+}
+
 /**
  * Simple deep merge for objects
  */
diff --git a/src/webui/index.js b/src/webui/index.js
index 9594621..13070f2 100644
--- a/src/webui/index.js
+++ b/src/webui/index.js
@@ -18,7 +18,7 @@ import { fileURLToPath } from 'url';
 import express from 'express';
 import { getPublicConfig, saveConfig, config } from '../config.js';
 import { DEFAULT_PORT, ACCOUNT_CONFIG_PATH } from '../constants.js';
-import { readClaudeConfig, updateClaudeConfig, getClaudeConfigPath } from '../utils/claude-config.js';
+import { readClaudeConfig, updateClaudeConfig, replaceClaudeConfig, getClaudeConfigPath } from '../utils/claude-config.js';
 import { logger } from '../utils/logger.js';
 import { getAuthorizationUrl, completeOAuthFlow, startCallbackServer } from '../auth/oauth.js';
 import { loadAccounts, saveAccounts } from '../account-manager/storage.js';
@@ -438,6 +438,41 @@ export function mountWebUI(app, dirname, accountManager) {
         }
     });
 
+    /**
+     * POST /api/claude/config/restore - Restore Claude CLI to default (remove proxy settings)
+     */
+    app.post('/api/claude/config/restore', async (req, res) => {
+        try {
+            const claudeConfig = await readClaudeConfig();
+
+            // Remove proxy-related environment variables to restore defaults
+            if (claudeConfig.env) {
+                delete claudeConfig.env.ANTHROPIC_BASE_URL;
+                delete claudeConfig.env.ANTHROPIC_AUTH_TOKEN;
+                delete claudeConfig.env.ANTHROPIC_MODEL;
+                delete claudeConfig.env.CLAUDE_CODE_SUBAGENT_MODEL;
+                delete claudeConfig.env.ANTHROPIC_DEFAULT_OPUS_MODEL;
+                delete claudeConfig.env.ANTHROPIC_DEFAULT_SONNET_MODEL;
+                delete claudeConfig.env.ANTHROPIC_DEFAULT_HAIKU_MODEL;
+                delete claudeConfig.env.ENABLE_EXPERIMENTAL_MCP_CLI;
+            }
+
+            // Use replaceClaudeConfig to completely overwrite the config (not merge)
+            const newConfig = await replaceClaudeConfig(claudeConfig);
+
+            logger.info(`[WebUI] Restored Claude CLI config to defaults at ${getClaudeConfigPath()}`);
+
+            res.json({
+                status: 'ok',
+                config: newConfig,
+                message: 'Claude CLI configuration restored to defaults'
+            });
+        } catch (error) {
+            logger.error('[WebUI] Error restoring Claude config:', error);
+            res.status(500).json({ status: 'error', error: error.message });
+        }
+    });
+
     /**
      * POST /api/models/config - Update model configuration (hidden/pinned/alias)
      */