The invention discloses a high voltage grounding wire apparatus. The high voltage grounding wire apparatus comprises an insulation operating lever, a wire terminal clamp and a power connection clamp, wherein the power connection clamp is in clamp connection with the wire terminal clamp in the circumferential-direction-spacing way; the wire terminal clamp is fixedly connected with the insulation operating lever; the insulation operating lever is hollow; an insulation operating handle is arranged at the middle part of the insulation operating lever and is spacing along the axial direction of the insulation operating lever; and the insulation operating handle is in threaded connection with the power connection clamp. When the high voltage grounding wire apparatus works, the power connection clamp which is in threaded connection with the insulation operating handle moves axially through rotation of the insulation operating handle, thus realizing adjustment of the distance between the power connection clamp and the wire terminal clamp so as to realize clamping and releasing of the wire. The wire terminal clamp and the insulation operating lever are fixed together; the insulation operating handle at the middle part of the insulation operating lever is used to drive the power connection clamp so as to guarantee that the insulation operating lever and the wire terminal clamp are fixed firmly so as to prevent unstable fixing of the wire or the ground wire because of rotation of the wire terminal clamp, thus guaranteeing the reliability for power supply and reducing the potential safety hazard.