Grounding device of transformer substation

The embodiment of the utility model discloses a grounding device of a transformer substation. The grounding device comprises: a U-shaped clamp element, a fixed flat iron screw, a grounded screw, and a butterfly-like clamp. The U-shaped clamp element includes a U-shaped clamp end and a hole-contained end; a first screw hole is arranged on a clamp branch of the U-shaped clamp end; the fixed flat iron screw is sleevedly connected to the U-shaped clamp element by the first screw hole; a second screw hole is arranged on the hole-contained end and the grounded screw is sleevedly arranged on the U-shaped clamp element by the second screw hole; one end of the grounded screw is provided with a grounded bolt for connecting a ground wire and the other end of the grounded screw is provided with screw threads for sleevedly connecting the butterfly-like clamp. According to the grounding device provided by the utility model, damages of the grounded flat iron and the ground wire can be avoided and a problem of ground wire matching can be solved.