The invention provides a diagnosis system of a high-voltage switch cabinet partial discharge signal, and belongs to the technical field of the electrical testing. The problem that the existing methodhas large subjectivity and boundedness and is unreliable. Each detection sensor group is connected with a signal input end of a signal preprocessing module, the signal output end of the signal preprocessing module is connected with the signal input end of an ADC processing module; the signal output end of the ADC processing module is connected with the signal input end of a first wireless transceiving module; the first wireless transceiving module is wirelessly connected with the second wireless transceiving module, the signal output end of the second wireless transceiving module is connectedwith the signal input end of a processing module; a first signal output end of the processing module is connected with a first signal input end of a display module; a second signal output end of the processing module is connected with the signal input end of a storage module, a third signal output end of the processing module is connected with the signal input end of a diagnosis module, the signaloutput end of the diagnosis module is connected with the second signal input end of the display module, and a fifth signal output end of the processing module is connected with the signal input end of an alarm module.