Multi-cave depot circulating type pumped storage system

A multi-cave-depot circulating type pumped storage system is composed of an underground powerhouse and a plurality of caverns, the underground powerhouse comprises a water pump and a main water turbine, the plurality of caverns are composed of an upper cavern, a middle cavern and a lower cavern, the upper cavern, the middle cavern and the lower cavern are correspondingly provided with an upper cavern, a middle cavern and a lower cavern respectively and are provided with water turbines in a matched mode, the caverns are connected through pilot tunnels, and water conveying pipelines are arranged in the pilot tunnels. In addition, fluids in the upper cave depot, the middle cave depot and the lower cave depot complement each other to form water source circulation, the middle cave depot and the lower cave depot generate electricity to solve nearby industrial and residential electricity consumption, redundant electricity is conveyed to an external power grid to be stored, underground powerhouse electricity is suppl