Outdoor GIS equipment grounding device

The utility model relates to the technical field of equipment for transformer substations, in particular to an outdoor GIS (gas insulated switchgear) equipment grounding device, which comprises a total station main grounding grid, a GIS special grounding grid, grounding flat iron and a GIS special grounding template. Grounding template holes are formed in the GIS special grounding template in a manner of penetrating through the upper and lower surfaces of the GIS special grounding template; the grounding flat iron is L-shaped, a GIS foundation top embedded part is welded to one end of the grounding flat iron, the other end of the grounding flat iron penetrates through the grounding template hole to be connected with the GIS special grounding grid, and one end, connected with the GIS special grounding grid, of the grounding flat iron is sleeved with a template plugging piece. The device solves the problem that in the prior art, direct connection of a GIS foundation top embedded part and a total station main gr