The utility model discloses a cable partial discharge monitoring system through the pulse current signal of signal reception module coupling cable partial discharge production, carries out data conversion through signal processing module to the pulse current signal and handles formation data signal, and rethread monitoring host computer carries out classification, analysis and calculation to data signal and forms the partial discharge 0 that discharges, through adopting the modularized design, the realization is to the online of cable partial discharge or off -line monitoring, time saving and labor saving, simultaneously can also carry out incessant monitoring to the partial discharge situation of cable, can know the current status of cable at any time, the quick potential safety hazard problem of accurately discovering the cable, and confirm maintenance scheduling according to the cable situation, can also carry out analytical judgement to the insulating degradation development trend of cable through the information data that discharges who forms in addition, judgement to the incipient fault of cable is provided the basis, make hidden danger in time discover in the budding stage, so that the safety of equipment is improved.