Server safety device and method and server

The embodiment of the invention discloses a server safety device and method and a server. The device comprises an optical fiber network card, an optical splitter and a network card driving module, a first optical module and a second optical module are arranged on the optical fiber network card; the network card driving module comprises a forwarding module, a sending filtering module and a receiving filtering module; the transmitting end and the receiving end of the first optical module are respectively connected with the input end and the first output end of the optical splitter; the second output end of the optical splitter is connected with the fiber switch; the second optical module configures an IP address, the receiving end is connected with the optical fiber switch, and the sending end is suspended; the forwarding module receives the message sent by the second optical module and forwards the message to the first optical module; the sending filtering module filters the message received by the forwarding