diff --git a/src/field/index.js b/src/field/index.js
index 8084445a7..73db41166 100644
--- a/src/field/index.js
+++ b/src/field/index.js
@@ -347,6 +347,8 @@ export default createComponent({
     onFocus(event) {
       this.focused = true;
       this.$emit('focus', event);
+      // https://github.com/youzan/vant/issues/9715
+      this.$nextTick(this.adjustSize);
 
       // readonly not work in legacy mobile safari
       /* istanbul ignore if */
@@ -361,6 +363,7 @@ export default createComponent({
       this.updateValue(this.value, 'onBlur');
       this.$emit('blur', event);
       this.validateWithTrigger('onBlur');
+      this.$nextTick(this.adjustSize);
       resetScroll();
     },