Flow-speed-controllable drainage device for pumped storage power station

The utility model discloses a drainage device capable of controlling flow velocity for a pumped storage power station, which belongs to the technical field of pumped storage power stations and comprises a dam, a mounting plate is mounted at the upper end of the dam, a drainage pump is mounted at the upper end of the mounting plate through a plurality of support legs, a transverse pipe is connected to the water inlet end of the drainage pump, and a water inlet component is connected to the outer end of the transverse pipe. The water outlet end of the drainage pump is connected with a liquid outlet pipe with a valve. The water inlet assembly comprises a U-shaped mounting frame, a rotating shaft, a gear, a sliding block, a moving pipe, a U-shaped sliding rod, a hose and a limiting groove. The adjusting motor is started to drive the rotating shaft to rotate, the movable pipe is driven to move obliquely through cooperation of the gear and the convex teeth, the position of the movable pipe can be adjusted, the wate