Abstract: A safety device, a server and a server safety realizing method. The safety device includes: a communication module used to be butted with an external communication interface provided by the server and realize information interaction with the server through the interface; a firmware module used to be pre-configured with at least one safety control policy; and a processing module used to perform at least one of the safety control strategies so as to realize the information safety protection of the server in real time when the server detects the safety device. A high speed safety device integrating the safety control policy, for example, a security chip card, is utilized to protect the safety of the server, realize the safe plug and play function of the server, and realize to process an external server as an independence network and also completely isolate the external server from an internal gateway.