下图是效果图

具体用到的代码如下

    <el-table-column label="头像" align="center" height="10px">
      <template slot-scope="scope">
        <el-popover placement="right" title="" trigger="hover">
          <img :src="scope.row.image_url" />
          <img slot="reference" :src="scope.row.image_url" :alt="scope.row.image_url" style="max-height: 50px;max-width: 130px">
        </el-popover>
      </template>
    </el-table-column>

参考：vue中element-ui表格缩略图悬浮放大功能的实例代码