Server cascade synchronization method and system and server

The embodiment of the invention provides a server cascade synchronization method and system and a server, and belongs to the technical field of computers. The server cascade synchronization method is used for a standby server, and comprises the following steps: under the condition that a main server is abnormal, determining that the main server is in an offline state and the server is in a working state, and sending a main-standby switching notification to a subordinate server, so that the subordinate server sends the main-standby switching notification to the subordinate server after receiving the main-standby switching notification; storing the information of the superior servers and determining the currently working superior server as a standby server, wherein the main-standby switching notification comprises the information of the main server and the information of the standby server as the currently working superior server; receiving a registration request of a subordinate server, and performing mutual r