The utility model provides a ground wire vibration damper for +/-500kV lines. The ground wire vibration damper can be used to increase the grid force of a wire clamp on a wire and prevent hammerheads from being disconnected from a steel stranded wire. The ground wire vibration damper for +/-500kV lines comprises two hammerheads and a wire clamp, wherein a steel stranded wire is connected between the two hammerheads, the wire clamp is composed of a wire clamp body and a wire clamp cover plate, one end of the wire clamp cover plate is connected with a hinge pin of the wire clamp body, the other end of the wire clamp cover plate is connected with a bolt of the wire clamp body, a wire stranding hole is opened in the wire clamp body and is sheathed on the steel stranded wire, the steel stranded wire is riveted to the two hammerheads, and the centers of a wire clamp head between the wire clamp body and the wire clamp cover plate, the hinge pin and the wire stranding hole are collinear. The ground wire vibration damper for +/-500kV lines can be quickly and conveniently installed on a wire, is easy to produce and process and applicable to a wide range of transmission lines, and can achieve good effect in preventing the vibration of wires.