The utility model discloses a detecting system for detecting partial discharge detector. Wherein, this system includes: signal generator for export the first signal to treat the detection partial discharge detector and non -inductive resistance, wherein, the first signal is voltage signal, non -inductive resistance is connected with signal generator for change the first signal into second signal, and with the 2nd signal transmission to waiting the partial discharge detector that detects, wherein, the second signal is the current signal, oscilloscope is connected with waiting the partial discharge detector who detects for according to the third signal that the partial discharge detector who treats the measuring exported, be used for the instruction to treat the partial discharge detector's of measuring performance parameter's testing result, partial discharge detector measuring the signal that the first signal and second signal obtained of this third signal for treating the measuring. The utility model provides a because accuracy that prior art can't detect partial discharge detector leads to the technical problem of the accuracy that undeterminable partial discharge measured.