The utility model provides a cable access device of partial discharge detector equipment, including cable joint and cable dustcoat, cable joint includes that insulating layer sleeve pipe, screw thread compress tightly set, insulation protection cover and the core bar that electrically conducts, insulating layer sleeve pipe top spin has closed two locking bolts, the screw rod end of locking bolt is equipped with the arc cover plate, on the electrically conductive core bar of the fixed cover disposed on of insulation protection cover, put in at insulation protection and be equipped with protruding circle, the end rotation that the screw compressed tightly the cover closes on the insulating layer sheathed tube other end, and the insulation protection cover is inserted in the screw compresses tightly the cover, and the screw compresses tightly the protruding circle of other end grasping that overlaps, the cable dustcoat includes arc cover, lower arc cover and fastening bolt, it covers through the hinge butt joint with lower arc to go up the arc cover, fastening bolt will go up the arc cover and descend the fastening of arc cover to be in the same place, a terminal is provided on the extrados of lower arc cover. The cable access device can insert the detected cable in quick just nothing destruction ground, and the structure reliably just contacts well, has better application prospect.