看起来是按照文本排序的，1是排在8前面的，下面是一个demo，9排在了7后面，并没有转成数字再排序

如果需要按数字排序，可以使用 sort-method 或者 sort-by 使用自定义的排序规则

demo如下

<el-table
      :data="tableData"
      style="width: 100%; margin-bottom: 20px"
      row-key="id"
    >
      <el-table-column prop="date" label="Date" sortable />
      <el-table-column prop="name" label="Name" sortable :sortMethod="sortMethod"/>
      <el-table-column prop="address" label="Address" sortable />
    </el-table>

const sortMethod = (a, b) => {
  if (parseInt(a.name) < parseInt(b.name)) {
    return -1
  }
  if (parseInt(a.name) > parseInt(b.name)) {
    return 1
  }
  return 0
}

Element Plus Playground

demo如下

<el-table
      :data="tableData"
      style="width: 100%; margin-bottom: 20px"
      row-key="id"
    >
      <el-table-column prop="date" label="Date" sortable />
      <el-table-column prop="name" label="Name" sortable :sortMethod="sortMethod"/>
      <el-table-column prop="address" label="Address" sortable />
    </el-table>

const sortMethod = (a, b) => {
  if (parseInt(a.name) < parseInt(b.name)) {
    return -1
  }
  if (parseInt(a.name) > parseInt(b.name)) {
    return 1
  }
  return 0
}

Element Plus Playground

🆗，谢啦