The utility model belongs to the technical field of the electrician examines and repair the instrument technique and specifically relates to an it meets ground wire device to test combination of electric formula, its characterized in that is equipped with by last roof, splint, what curb plate and lower plate were constituteed presss from both sides to one side open -ended wire frame, splint are through the slider, the spout is connected with the curb plate, the roof is kept silent with the corresponding shape of face one -tenth wire of splint on the messenger, push -and -pull rod one end is connected with splint, the other end passes the lower plate and arranges in the insulator spindle, be equipped with the pressure spring on the push -and -pull rod between splint and the lower plate, be equipped with nearly electric precaution device and staple bolt on the insulator spindle, the pole spout of stopping that curved pole of stopping passed on the insulator spindle is connected with the push -and -pull rod, the insulator spindle both ends are connected with lower plate and telescopic link respectively, wire frame clamp top is equipped with pronunciation formula high -voltage electroscope and the scissors is clear away to the wire foreign matter, the wire frame presss from both sides the side and is equipped with ground lead, the last ground screw that is equipped with of ground lead, be equipped with the callus on the sole on the ground screw, the utility model discloses the security is high, and convenient operation has improved electric power operator person's work efficiency greatly.