Water diversion system of pumped storage power station and construction method of water diversion system

The water diversion system comprises an upper reservoir and an underground powerhouse, and the elevation difference between a water outlet of the water diversion system of the upper reservoir and a water inlet of the underground powerhouse is larger than or equal to 800 m; when the surrounding rock grade is III grade or IV grade or V grade, a two-stage vertical shaft and adit type water diversion system is adopted, and the water diversion system comprises an upper adit, an upper vertical shaft, a middle adit, a lower vertical shaft and a adit body formed by the lower adit which are connected in sequence; when the grade of the surrounding rock is grade I or grade II, a two-stage inclined shaft and adit type water diversion system is adopted, and the water diversion system comprises a tunnel body formed by an upper inclined shaft, a middle adit and a lower inclined shaft which are connected in sequence; a water diversion pressure steel pipe is arranged in the hole body in a penetrating manner; a main constructi