Data synchronization method and device, server and medium

The embodiment of the invention is suitable for the technical field of computers, and provides a data synchronization method and device, a server and a medium, and the method comprises the steps: building a communication channel between an edge end and a cloud end when a connection request of the edge end is received, and the communication channel is used for transmitting data between the edge end and the cloud end; if it is monitored that the incremental data exist in the cloud, synchronizing the incremental data to a cloud local cache; and sending the incremental data in the cloud local cache to the side end through the communication channel so as to synchronize the incremental data in the side end local cache. Through the method, the incremental data of the cloud can be actively pushed to the edge end, so that the edge end data and the cloud data are synchronized. 本申请实施例适用于计算机技术领域，提供了一种数据同步方法、装置、服务器及介质，所述方法包括：当接收到边端的连接请求时，在所述边端和云端之间建立通讯通道，所述通讯通道用于在所述边端和所述云端之间传输数据；若监测到所述云端存在增量数据时，将所述增量数据同步至云端本地缓存；将所述云端本地缓存中