diff --git a/packages/vant-cli/src/common/index.ts b/packages/vant-cli/src/common/index.ts
index 9048bbda8..8b80c2587 100644
--- a/packages/vant-cli/src/common/index.ts
+++ b/packages/vant-cli/src/common/index.ts
@@ -99,4 +99,8 @@ export function setNodeEnv(value: NodeEnv) {
   process.env.NODE_ENV = value;
 }
 
+export function isDev() {
+  return process.env.NODE_ENV === 'development';
+}
+
 export { decamelize };
diff --git a/packages/vant-cli/src/config/webpack.site.prd.ts b/packages/vant-cli/src/config/webpack.site.prd.ts
index 7ee6a8e70..60e0fbc5b 100644
--- a/packages/vant-cli/src/config/webpack.site.prd.ts
+++ b/packages/vant-cli/src/config/webpack.site.prd.ts
@@ -1,11 +1,13 @@
 import merge from 'webpack-merge';
 import { get } from 'lodash';
-import { getWebpackConfig } from '../common';
+import { isDev, getWebpackConfig } from '../common';
 import { siteDevBaseConfig } from './webpack.site.dev';
 import { CONFIG, SITE_DIST_DIR } from '../common/constant';
 
 const outputDir = get(CONFIG, 'build.site.outputDir', SITE_DIST_DIR);
-const publicPath = get(CONFIG, 'build.site.publicPath', '/');
+
+// always use '/' as publicPath in dev mode
+const publicPath = isDev() ? '/' : get(CONFIG, 'build.site.publicPath', '/');
 
 export const sitePrdConfig = merge(
   siteDevBaseConfig,