The invention relates to the technical field of power grounding wires, in particular to an automatic winding device for a grounding wire. The automatic winding device for the grounding wire comprisesa bottom plate, a case is arranged on the bottom plate and internally provided with a motor, the end, away from the motor, of an output shaft of the motor is connected with a winding pile, the windingpile is provided with a wire clamping device, the wire clamping device comprises a fixing block and a fixator, the fixing block is provided with a wire clamping hole, and a fixing hole communicatingwith the wire clamping hole is formed in the side, away from the winding pile, of the fixing block; and a plurality of clamping grooves are formed in the side wall of the fixing hole, the fixator comprises an operation head, a fixing rod is arranged on one side of the operation head, a clamping block is arranged on one side of the fixing rod, a pressing groove is formed in the side, away from theclamping block, of the fixing rod, a pressing block is slidably arranged in the pressing groove, and the pressing block and the side wall of the pressing groove are connected through a pressing spring. According to the automatic winding device for the grounding wire, the take-up efficiency of the grounding wire is improved, the time and labor are saved, the phenomena of knotting, abrasion and thelike are avoided, and the service life of the grounding wire is long.