A ground potential R pin replenisher comprises a bracket, a crank arm, a screw and a cartridge. When an R pin is inserted into the receptacle and the opening of the R pin is ensured to be in a closedstate, the R pin is inserted into the pin hole of the nut by holding the insulating operating lever, and the insulating operating lever is rotated, so that the bracket drives the crank arm to rotate,the crank arm drives the screw rod to rotate, and when the screw rod rotates in the screw hole of the cartridge and advances axially, so that the head end of the screw rod presses the R pin outwardlyuntil the R pin is pushed out from the socket hole of the cartridge. As that crank arm and the bracket are articulate, the operation of different angles is convenient. To replenish the ground potential becomes possible. The loss caused by temporary power outage is avoided, and the defect can be found and eliminated at any time without combining with the power outage maintenance plan of the transmission line. As the lead does not need to be put down, the safety and controllability are high, the live lead does not need to be directly contacted, the risk of electric shock does not exist, tediouspre-service preparation work is not needed, and the required cooperation personnel are few, and the time and labor are saved.