The invention relates to a ground wire clamp which comprises a side plate and a top plate. The side plate is arc-shaped, one end of the side plate is connected with the top plate, a first fixing groove is arranged on the end face of the other end of the side plate, the side plate is connected with a base plate through the first fixing groove, and two fixing plates are installed at two ends of the base plate respectively. The fixing plates are matched with the first fixing groove, the middle of the base plate is provided with a sixth connecting hole, a connecting pipe is arranged on the sixth connecting hole, one end of the connecting pipe is fixed on the upper surface of the base plate, and a first limiting round block is installed at the other end of the connecting pipe. The ground wire clamp has the advantages that a round conductor can be fixed by enabling a press block to be matched with the side plate, a rectangular conductor can be fixed by enabling a press plate to be matched with the side plate, the press block is connected with the press plate, conductors of different shapes can not only be fixed respectively, but also be convenient to replace, a wire is pressed firmly and cannot be dropped easily, and the conductors are fixed on the base plate through an upper press plate, so that the conductors are fixed firmly. By using a hanging buckle, the ground wire clamp is convenient to carry and cannot be dropped easily.