Gas-insulated switchgear and gas tank thereof

The invention relates to a gas-insulated switchgear and a gas tank thereof, and the gas tank of the gas-insulated switchgear comprises a tank body, a solid-sealed polar pole is arranged in the tank body, the solid-sealed polar pole is vertically arranged, and the solid-sealed polar pole is provided with an upper wire outlet seat and a lower wire outlet seat; a lower isolation moving contact is assembled in the lower wire outlet seat along the vertical direction in a conductive sliding manner, a lower isolation static contact and a grounding static contact are arranged below the lower wire outlet seat in the box body, a lower isolation fracture is formed between the lower isolation moving contact and the lower isolation static contact, and the grounding static contact is in conductive connection with the lower isolation static contact; the bottom of the box body is provided with an incoming and outgoing line sleeve, the incoming and outgoing line sleeve is connected with a bus, and one of the grounding static