The application discloses a server monitoring method, device and system and a baseboard management controller. One specific embodiment of the server monitoring method comprises the following steps: receiving a server monitoring request which is sent by a terminal and packaged with a predetermined first transmission protocol, wherein the first transmission protocol is different from a second transmission protocol used by a network of a data center in which a local machine is positioned; performing protocol conversion on the server monitoring request based on the second transmission protocol; acquiring state information of a server in response to the converted server monitoring request; and packaging the state information with the first transmission protocol, and transmitting the packaged state information to the terminal. Through adoption of the server monitoring method, device and system, the terminal can send the server monitoring request by using a transmission way of the first transmission protocol without accessing a data center machine room network, and field operation and maintenance management personnel can rapidly acquire the state information of the server without acquiring an IP (Internet Protocol) address of the server.