The invention discloses a ground potential live working lead polisher. The ground potential live working lead polisher is characterized by comprising a clamp head, a supporting rod and a handle, a lead clamping groove is formed in the middle of each of two jaw contact faces of the clamp head, belt wheels are arranged on a movable jaw and a fixed jaw around the grooves in one sides of the movable jaw and the fixed jaw respectively, a polishing belt is arranged on the belt wheels which are connected with a transmission shaft through a transmission device, traveling wheels which are arranged oppositely to drive a lead to move back and forth in the grooves are arranged on the other sides of the movable jaw and the fixed jaw through a wheel frame respectively, a wheel shaft of at least one traveling wheel is connected with a traveling motor, the movable jaw is provided with a jaw tie bar, the other end of the jaw tie bar is connected with the supporting rod and an angle handle on the handle, the fixed jaw is provided with a clamp head rotating tie bar, and the other end of the clamp head rotating tie bar is connected with the supporting rod or a rotating handle on the handle. Length of the supporting rod can meet safe distance during live operation, and the ground potential live working lead polisher is convenient to mount and carry.