Data synchronization method and device, equipment and medium

The invention discloses a data synchronization method and device, equipment and a medium, and the method comprises the steps: receiving a first query request sent by a synchronization client, the first query request is used for querying target data for data synchronization, and the first query request comprises a data screening condition and a query mode; the data screening condition is used for screening target data needing to be synchronized, the data screening condition comprises a composite index, and the composite index comprises a time field and a serial number field; querying target data for data synchronization from a database according to the first query request; and returning the target data to the synchronization client, so that the synchronization client writes the target data into a database of the synchronization client to realize data synchronization, and stable and rapid data synchronization can be realized. 本申请公开了一种数据同步方法、装置、设备和介质，其中，方法包括：接收同步客户端发送的第一查询请求，第一查询请求用于查询用于数据同步的目标数据，第一查询请求包括数据筛选条件和