实现方法如下：

<?php
namespace App\Models;

use DB;
use Illuminate\Database\Eloquent\Model;

/**
 * 学生表模型
 */
class Students extends Model
{
 protected $table = 'students';

 //批量更新
 public function updateBatch($multipleData = [])
 {
  try {
   if (empty($multipleData)) {
    throw new \Exception("数据不能为空");
   }
   $tableName = DB::getTablePrefix() . $this->getTable(); // 表名
   $firstRow = current($multipleData);

   $updateColumn = array_keys($firstRow);
   // 默认以id为条件更新，如果没有ID则以第一个字段为条件
   $referenceColumn = isset($firstRow['id']) ? 'id' : current($updateColumn);
   unset($updateColumn[0]);
   // 拼接sql语句
   $updateSql = "UPDATE " . $tableName . " SET ";
   $sets  = [];
   $bindings = [];
   foreach ($updateColumn as $uColumn) {
    $setSql = "`" . $uColumn . "` = CASE ";
    foreach ($multipleData as $data) {
     $setSql .= "WHEN `" . $referenceColumn . "` = ? THEN ? ";
     $bindings[] = $data[$referenceColumn];
     $bindings[] = $data[$uColumn];
    }
    $setSql .= "ELSE `" . $uColumn . "` END ";
    $sets[] = $setSql;
   }
   $updateSql .= implode(', ', $sets);
   $whereIn = collect($multipleData)->pluck($referenceColumn)->values()->all();
   $bindings = array_merge($bindings, $whereIn);
   $whereIn = rtrim(str_repeat('?,', count($whereIn)), ',');
   $updateSql = rtrim($updateSql, ", ") . " WHERE `" . $referenceColumn . "` IN (" . $whereIn . ")";
   // 传入预处理sql语句和对应绑定数据
   return DB::update($updateSql, $bindings);
  } catch (\Exception $e) {
   return false;
  }
 }
}

可以根据自己的需求再做调整，下面是用法实例：

// 要批量更新的数组
$students = [
 ['id' => 1, 'name' => '张三', 'email' => 'zhansan@qq.com'],
 ['id' => 2, 'name' => '李四', 'email' => 'lisi@qq.com'],
];

// 批量更新
app(Students::class)->updateBatch($students);

生成的SQL语句如下：

UPDATE pre_students
SET NAME = CASE
WHEN id = 1 THEN
 '张三'
WHEN id = 2 THEN
 '李四'
ELSE
 NAME
END,
 email = CASE
WHEN id = 1 THEN
 'zhansan@qq.com'
WHEN id = 2 THEN
 'lisi@qq.com'
ELSE
 email
END
WHERE
 id IN (1, 2)