Fault diagnosis system and device

The invention provides a fault diagnosis system and device, and relates to the technical field of fault processing. The method comprises the steps of: judging whether the running state of the target monitoring object system is changed or not; if the running state of the target monitoring object system changes, obtaining each piece of monitoring object running state information acquired by aiming at each target monitoring object included in the target monitoring object system, and obtaining multiple pieces of monitoring object running state information, wherein each target monitoring object is a device included in a target monitoring object system, the device runs to generate monitoring object running state information, and the number of the target monitoring objects is multiple; and generating whether the operation state change of the target monitoring object system based on the fault of the included target monitoring object is determined based on the multiple pieces of monitoring object operation state infor