diff --git a/packages/components/tree/src/model/tree-store.ts b/packages/components/tree/src/model/tree-store.ts
index d5ec368d30..f3215fde4b 100644
--- a/packages/components/tree/src/model/tree-store.ts
+++ b/packages/components/tree/src/model/tree-store.ts
@@ -103,6 +103,7 @@ export default class TreeStore {
   setData(newVal: TreeData): void {
     const instanceChanged = newVal !== this.root.data
     if (instanceChanged) {
+      this.nodesMap = {}
       this.root.setData(newVal)
       this._initDefaultCheckedNodes()
     } else {