The invention provides earthing lines of power transmission lines overhauling and a hooking method thereof, and the earthing line comprises a wire end clip capable of hooking and dismantling with a power transmission line, an earth terminal fixed clamp capable of being fixedly connected with an earth terminal and an earth short-circuit line for connecting the wire end clip and the earth terminal fixed clamp. The wire end clip is also connected with an insulating rope for performing the operation of hooking and dismantling the wire end clip, a GPS information transceiver is arranged on the earth terminal fixed clamp, and the wire end clip is also provided with a reversed hook and a magnet sheet. The invention can realize GPS precise location for power transmission line overhauling positions, avoid easily-generated risks of malposition caused by false hooking and dismantling and the process of hanging earthing lines by maintenance personnel, lower work difficulty and be widely used in overhauling earthing protection of high-voltage power transmission line.