The utility model provides a lead ground wire and stride across abrasionproof damage device, relate to the transmission line field, the both ends of screw rod are fixed with the bearing, the outside of bearing is provided with the packing ring, the both ends of screw rod pass respectively two U types for the support nut fixed, the screw rod has 4 at least, the constant diameter equipartition sets up, there is open -ended abrasionproof roller cover on the bearing, the middle part top of U type support is fixed with the pulley support, be provided with the pulley on the pulley support, still there is the buckle through bolt swing joint on the U type support, be provided with the spring catch on the buckle, be provided with the locating hole on the U type support, spring catch and locating hole cooperation, the both sides of U type support are fixed with protective column through the bearing frame, U type support bottom is provided with the aversion hole. The utility model has the advantages of the utility model discloses simple structure, simple to operate, guardwire do not receive wearing and tearing, postpone morally life of wire.