The utility model discloses an experiment tool for checking a transient ground voltage partial discharge detector. The device structurally comprises a box body, a metal electrode, a metal rod, an insulating plate, a foam plate and a test wire, wherein one side of the inner cavity of the box body is provided with an insulating plate and a metal electrode, a metal rod is arranged between the insulating plate and the metal electrode, two ends of the metal electrode are respectively provided with a test wire, the bottom wall of the inner cavity of the box body is provided with a foam plate, and adischarge detector placing cavity is formed between the metal electrode and the side wall of the box body. When the tool is used for carrying out discharge detection, a discharge detection instrumentcan be arranged in the box body, so that external interference is effectively shielded and reduced, and the calibration accuracy of the detector is improved.