A switchgear partial discharge detecting system is used for accurately detecting and positioning switchgear partial discharge. The technical scheme includes that the switchgear partial discharge detecting system comprises a tablet computer, a data acquisition card, a TEV sensor, an ultrahigh frequency sensor and four ultrasonic sensors, wherein the TEV sensor, the ultrahigh frequency sensor and the ultrasonic sensors are mounted in different positions of the surface of a switchgear, their signal output ends are connected with different input ends of the data acquisition cards, the signal output end of the data acquisition card is connected with the tablet computer, and the tablet computer is connected with an upper computer via a wireless network. By adopting three kinds of sensors complementing each other's advantages, switchgear partial discharge can be monitored jointly, not only can interference generated by onsite complicated surroundings be avoided but detection accuracy is improved. In addition, partial discharge source can be accurately positioned and discharge modes can be accurately identified; detection level of switchgear partial discharge is greatly improved.