Underground substation structure

The invention discloses an underground substation structure. The underground substation structure comprises a building raft foundation, an underground diaphragm wall and a lining wall, wherein the building raft foundation is arranged in the range of the outer side of the underground substation structure; the lining wall is arranged on the inner side of the building raft foundation; a main transformer chamber is arranged on the building raft foundation; an outdoor sinking courtyard is arranged on the outer side of the main transformer chamber; and a fire-fighting water pool is arranged below the outdoor sinking courtyard. According to the underground substation structure, the problem of water leakage caused by equipment hoisting can be effectively solved, and meanwhile, equipment hoisting is more convenient during later operation and maintenance; due to the fact that the whole wall body faces the outdoor space, ventilation in a station can reach the ventilation condition of an overground substation, ventilatio