diff --git a/src/i18n/locales/en.json b/src/i18n/locales/en.json
index cd5c1df..6998856 100644
--- a/src/i18n/locales/en.json
+++ b/src/i18n/locales/en.json
@@ -72,7 +72,15 @@
     "submitting": "Connecting...",
     "error_title": "Login Failed",
     "error_required": "Please fill in complete connection information",
-    "error_invalid": "Connection failed, please check address and key"
+    "error_invalid": "Connection failed, please check address and key",
+    "error_network": "Network connection failed, please check your network or server address",
+    "error_timeout": "Connection timed out, server not responding",
+    "error_unauthorized": "Authentication failed, invalid management key",
+    "error_forbidden": "Access denied, insufficient permissions",
+    "error_not_found": "Server address invalid or management API not enabled",
+    "error_server": "Internal server error, please try again later",
+    "error_cors": "Cross-origin request blocked, please check server configuration",
+    "error_ssl": "SSL/TLS certificate verification failed"
   },
   "header": {
     "check_connection": "Check Connection",
diff --git a/src/i18n/locales/zh-CN.json b/src/i18n/locales/zh-CN.json
index 0741e93..c69d536 100644
--- a/src/i18n/locales/zh-CN.json
+++ b/src/i18n/locales/zh-CN.json
@@ -72,7 +72,15 @@
     "submitting": "连接中...",
     "error_title": "登录失败",
     "error_required": "请填写完整的连接信息",
-    "error_invalid": "连接失败，请检查地址和密钥"
+    "error_invalid": "连接失败，请检查地址和密钥",
+    "error_network": "网络连接失败，请检查网络或服务器地址",
+    "error_timeout": "连接超时，服务器无响应",
+    "error_unauthorized": "认证失败，管理密钥无效",
+    "error_forbidden": "访问被拒绝，权限不足",
+    "error_not_found": "服务器地址无效或管理接口未启用",
+    "error_server": "服务器内部错误，请稍后重试",
+    "error_cors": "跨域请求被阻止，请检查服务器配置",
+    "error_ssl": "SSL/TLS 证书验证失败"
   },
   "header": {
     "check_connection": "检查连接",
diff --git a/src/pages/LoginPage.tsx b/src/pages/LoginPage.tsx
index 1f16ab0..255af84 100644
--- a/src/pages/LoginPage.tsx
+++ b/src/pages/LoginPage.tsx
@@ -7,8 +7,52 @@ import { IconEye, IconEyeOff } from '@/components/ui/icons';
 import { useAuthStore, useLanguageStore, useNotificationStore } from '@/stores';
 import { detectApiBaseFromLocation, normalizeApiBase } from '@/utils/connection';
 import { INLINE_LOGO_JPEG } from '@/assets/logoInline';
+import type { ApiError } from '@/types';
 import styles from './LoginPage.module.scss';
 
+/**
+ * 将 API 错误转换为本地化的用户友好消息
+ */
+function getLocalizedErrorMessage(error: any, t: (key: string) => string): string {
+  const apiError = error as ApiError;
+  const status = apiError?.status;
+  const code = apiError?.code;
+  const message = apiError?.message || '';
+
+  // 根据 HTTP 状态码判断
+  if (status === 401) {
+    return t('login.error_unauthorized');
+  }
+  if (status === 403) {
+    return t('login.error_forbidden');
+  }
+  if (status === 404) {
+    return t('login.error_not_found');
+  }
+  if (status && status >= 500) {
+    return t('login.error_server');
+  }
+
+  // 根据 axios 错误码判断
+  if (code === 'ECONNABORTED' || message.toLowerCase().includes('timeout')) {
+    return t('login.error_timeout');
+  }
+  if (code === 'ERR_NETWORK' || message.toLowerCase().includes('network error')) {
+    return t('login.error_network');
+  }
+  if (code === 'ERR_CERT_AUTHORITY_INVALID' || message.toLowerCase().includes('certificate')) {
+    return t('login.error_ssl');
+  }
+
+  // 检查 CORS 错误
+  if (message.toLowerCase().includes('cors') || message.toLowerCase().includes('cross-origin')) {
+    return t('login.error_cors');
+  }
+
+  // 默认错误消息
+  return t('login.error_invalid');
+}
+
 export function LoginPage() {
   const { t } = useTranslation();
   const navigate = useNavigate();
@@ -81,7 +125,7 @@ export function LoginPage() {
       showNotification(t('common.connected_status'), 'success');
       navigate('/', { replace: true });
     } catch (err: any) {
-      const message = err?.message || t('login.error_invalid');
+      const message = getLocalizedErrorMessage(err, t);
       setError(message);
       showNotification(`${t('notification.login_failed')}: ${message}`, 'error');
     } finally {