diff --git a/src/nav-bar/index.js b/src/nav-bar/index.js
index 3e43cf120..1a64c783f 100644
--- a/src/nav-bar/index.js
+++ b/src/nav-bar/index.js
@@ -31,7 +31,13 @@ export default createComponent({
 
   mounted() {
     if (this.placeholder && this.fixed) {
-      this.height = this.$refs.navBar.getBoundingClientRect().height;
+      const setHeight = () => {
+        this.height = this.$refs.navBar.getBoundingClientRect().height;
+      };
+
+      setHeight();
+      // https://github.com/youzan/vant/issues/10131
+      setTimeout(setHeight, 100);
     }
   },