1.在树结构对应的数据中，给需要自定义层的数据添加scopedSlots属性

this.siteList = [{name: "parent1",children: [{name: "children1",},],},{name: "parent2",children: [{name: "children1",},{name: "children2",},],
}];
this.treeData.forEach( parent => {parent.scopedSlots = {title: "parent",};parent.children.forEach( son => {son.scopedSlots = {title: "son",};})
})

2. 在template中输入自定义内容

<a-tree :tree-data="treeData"><template slot="parent" slot-scope="item"><img src="../assets/img/parent.png" alt=""><span>{{ item.name }}</span></template><template slot="son" slot-scope="item"><img src="../assets/img/son.png" alt=""><span>{{ item.name }}</span></template>
</a-tree>

效果如图