The invention provides a grounding wire clamp, and belongs to the technical field of grounding wire tools. The grounding wire clamp comprises a wire clamp body of an inverted U-shaped structure, two conductive clips connected into an inverted U-shaped groove of the wire clamp body separately, an insulating rod connected to the wire clamp body and a self-locking mechanism arranged in the inverted U-shaped groove of the wire clamp body; the self-locking mechanism comprises a return spring connected with the inverted U-shaped groove, a ball connected with the return spring and a clamping body which is connected with the inverted U-shaped groove and used for fixing the ball; the two conductive clips are symmetrically arranged along the center line of the wire clamp body, and a clamp spring isconnected between the conductive clips and the wire clamp body; the center line of the return spring and the center line of the wire clamp body are colinear; the clamping body is located on the upperportions of the two conductive clips. According to the grounding wire clamp, the action of disassembling a wire can be completed conveniently and rapidly, and the grounding wire clamp has the advantages of being simple in structure, convenient to operate and safe in use.