diff --git a/src/i18n/locales/en.json b/src/i18n/locales/en.json
index 61224f8..276f52e 100644
--- a/src/i18n/locales/en.json
+++ b/src/i18n/locales/en.json
@@ -767,6 +767,7 @@
     "api_key_added": "API key added successfully",
     "api_key_updated": "API key updated successfully",
     "api_key_deleted": "API key deleted successfully",
+    "api_key_invalid_chars": "API key can only contain letters, numbers, and symbols",
     "gemini_key_added": "Gemini key added successfully",
     "gemini_key_updated": "Gemini key updated successfully",
     "gemini_key_deleted": "Gemini key deleted successfully",
diff --git a/src/i18n/locales/zh-CN.json b/src/i18n/locales/zh-CN.json
index b84e8d0..34fbb2c 100644
--- a/src/i18n/locales/zh-CN.json
+++ b/src/i18n/locales/zh-CN.json
@@ -767,6 +767,7 @@
     "api_key_added": "API密钥添加成功",
     "api_key_updated": "API密钥更新成功",
     "api_key_deleted": "API密钥删除成功",
+    "api_key_invalid_chars": "API密钥仅支持英文字母、数字和符号",
     "gemini_key_added": "Gemini密钥添加成功",
     "gemini_key_updated": "Gemini密钥更新成功",
     "gemini_key_deleted": "Gemini密钥删除成功",
diff --git a/src/pages/ApiKeysPage.tsx b/src/pages/ApiKeysPage.tsx
index fb9eb63..3461151 100644
--- a/src/pages/ApiKeysPage.tsx
+++ b/src/pages/ApiKeysPage.tsx
@@ -9,6 +9,7 @@ import { LoadingSpinner } from '@/components/ui/LoadingSpinner';
 import { useAuthStore, useConfigStore, useNotificationStore } from '@/stores';
 import { apiKeysApi } from '@/services/api';
 import { maskApiKey } from '@/utils/format';
+import { isValidApiKeyCharset } from '@/utils/validation';
 import styles from './ApiKeysPage.module.scss';
 
 export function ApiKeysPage() {
@@ -83,6 +84,10 @@ export function ApiKeysPage() {
       showNotification(`${t('notification.please_enter')} ${t('notification.api_key')}`, 'error');
       return;
     }
+    if (!isValidApiKeyCharset(trimmed)) {
+      showNotification(t('notification.api_key_invalid_chars'), 'error');
+      return;
+    }
 
     const isEdit = editingIndex !== null;
     const nextKeys = isEdit
diff --git a/src/utils/validation.ts b/src/utils/validation.ts
index a92ad16..e1cf66f 100644
--- a/src/utils/validation.ts
+++ b/src/utils/validation.ts
@@ -35,6 +35,14 @@ export function isValidApiKey(key: string): boolean {
   return !/\s/.test(key);
 }
 
+/**
+ * 验证 API Key 字符集（仅允许 ASCII 可见字符）
+ */
+export function isValidApiKeyCharset(key: string): boolean {
+  if (!key) return false;
+  return /^[\x21-\x7E]+$/.test(key);
+}
+
 /**
  * 验证 JSON 格式
  */