The invention provides a novel power system arc-extinguishing earthing device, which mainly relates to the field of power equipment. A novel power system arc-extinguishing earthing device comprises abottom shell, wherein the bottom shell is an insulating shell; A contact plate, wherein the contact plate is an electrically conductive material; A permanent magnet lifter for providing magnetic attraction to an iron plate on a housing of an electric power equipment; A top shell which is detachably and fixedly connected with the bottom shell; Connecting seat; Connecting rod, wherein the connectingrod is a sectional structure; A push rod head, wherein the top part of the push rod head is provided with a sleeve which is matched with a switch of a permanent magnet lifter, and the sleeve is hinged with the push rod head; A ground wire that passes through the side of the bottom/top shell. The invention has the beneficial effects that the grounding wire can be quickly connected to the equipment, the time of arc generation can be reduced, the arc can be elongated through a slit to achieve the arc extinguishing purpose, the instantaneous temperature of the arc generation area can be reduced,and the equipment can be protected.