Three-station isolation ground switch

The invention relates to a three-station isolation ground switch in the technical field of high-voltage switches, comprising a shell, insulating parts, a static side part, a moving contact, a moving contact seat, a transmission structure, a support seat, a grounded part and an end cover, wherein the support seat and an inner cavity insulation part are arranged in the inner cavity of the shell in sequence; the moving contact seat is fixedly arranged on the support seat; the transmission structure is arranged on the moving contact seat and is meshed with the moving contact arranged in a conductor hole of the moving contact seat, and the moving contact is driven to be respectively contact with the grounded part and the static side part; the two insulating parts and the end cover are respectively connected with the shell; the static side part is arranged on the insulation parts of the inner cavity of the shell; and the grounded part is arranged on the end cover. In the invention, the whole three-station isolation