The invention relates to a high-voltage power grid overhauling tool and especially relates to a grounding wire clamp dedicated to a DC 800kV strain tower current drainage aluminum pipe. In the grounding wire clamp dedicated to a DC 800kV strain tower current drainage aluminum pipe, one end of a supporting rod is rotatably connected with a right clamping plate while the other end of the supporting rod is arranged in an accommodating space when a clamping component is loosened. A left clamping plate is equipped with a cooperation groove used for accommodating the supporting rod when the clamping component is clamped. In a using process, one end of the supporting rod is arranged in the accommodating space when the clamping component is loosened. A clamped object enters the accommodating space and then contacts the supporting rod in order that the supporting rod may enter the cooperation groove. Thus, the clamping component is clamped. In the using process, a jam phenomenon is prevented and the clamping component clamps the clamped objected reliably. The grounding wire clamp dedicated to a DC 800kV strain tower current drainage aluminum pipe is completely suitable for overhaul and emergency maintenance of a grounding wire clamp dedicated to a DC 800kV strain tower power transmission line and achieves convenient overhaul and emergency maintenance operation of the DC 800kV strain tower power transmission line.