The present invention discloses a method for remotely controlling working of a communications terminal, and the method includes: receiving, in a push service manner, a management and control instruction actively provided by the server; parsing, according to a predetermined data exchange format, the received management and control instruction, so as to obtain corresponding operation information and acquire a device identifier, where the operation information includes command information and additional information; generating a corresponding working instruction according to the command information and the additional information that are obtained through parsing; and executing, according to the working instruction, work for protecting data security. The present invention further provides a server for remotely controlling working of a communications terminal, and a communications terminal. The present invention is capable of flexibly and conveniently controlling working of a lost communications terminal through the server for remotely controlling working of a communications terminal.