diff --git a/packages/pagination/src/sizes.vue b/packages/pagination/src/sizes.vue
index 12e4bf5949..5cc03ae954 100644
--- a/packages/pagination/src/sizes.vue
+++ b/packages/pagination/src/sizes.vue
@@ -59,6 +59,10 @@ export default defineComponent({
       }
     })
 
+    watch(() => props.pageSize, newVal => {
+      innerPageSize.value = newVal
+    })
+
     const innerPagesizes = computed(() => props.pageSizes)
 
     function handleChange(val: number) {