Method and device for data cleaning of server and server

The embodiment of the invention provides a method and device for data cleaning of a server and the server. The method comprises the steps that a data cleaning instruction is generated when a judgment result shows that a start operation of a router being started is a restart operation conducted after factory setting restoring, wherein the data cleaning instruction comprises an identification of the router; and the data cleaning instruction is sent to a cloud side server, the cloud side server is driven to search for an account number binding relation corresponding to the router identification among pre-stored account number binding relations, the corresponding account number binding relation is deleted after the corresponding account number binding relations is found and response information is generated and returned to the router, wherein the account number binding relation is a binding relation between the router identification and login account number information of a user. By the method, device and server