Ventilation system for underground powerhouse of hydroelectric power station

The utility model relates to the technical field of pumped storage power stations, in particular to a ventilation system for an underground powerhouse of a hydroelectric power station, which comprises a ventilation and safety hole communicated with the ground, a main powerhouse hole and an auxiliary powerhouse hole, and a main transformer exhaust hole for exhausting air from the main transformer hole, the ventilation and safety hole is divided into a first hole body used for exhausting air by the firewall, and the main and auxiliary plant holes, the main transformer exhaust hole, the exhaust shaft lower adit and the exhaust shaft are communicated through the first hole body. According to the utility model, the firewall is used for division, the ventilation and safety hole is combined with the air exhaust vertical shaft to serve as an accident smoke and air exhaust channel of the main and auxiliary plant holes and the main variable hole, and ventilation holes do not need to be excavated respectively for the ma