The utility model discloses an improved ground wire clamp. The improved ground wire clamp comprises a reversed U-shaped body (1), a ground wire set screw (2), and a puller screw (4). The bottom surface and a side surface of the reversed U-shaped body (1) are respectively provided with threaded holes. The bottom threaded hole is installed with the ground wire set screw (2). The side threaded hole is installed with the puller screw (4). The puller screw (4) is provided with a handle (5). The improved ground wire clamp is simple in structure and convenient in operation, and can be used on a flat iron grounding component, and can also be used on a cylindrical grounding component. The ground wire clamp is wide in application range. Contact area with the grounding component is large, and the contact is surface contact. Fixation is firm, and a wire is not easy to get loose, thereby ensuring security of electric power and ensuring personal safety.