Energy-gathering drainage valve

The invention discloses an energy-gathering drainage valve comprising a drainage valve body, a valve block, a water inlet window, a sealing port, a fastener, a check valve block, a check valve port, an overflow pipe, and an overflow pore, wherein the check valve port and the check valve block are arranged inside the overflow pipe; when started flushing by people, the valve block and the sealing port are opened, a positive pressure inside a sanitary appliance pipeline allows the check valve port and the check valve block to be in a sealed state, and accordingly the air inside the sanitary appliance pipeline is compressed in situ; the compressed air takes effect of efficiently conducting the kinetic energy of the water flow, thereby improving the flushing effect; when finished flushing, the valve block and the sealing port are closed, the water at a higher position inside the sanitary appliance pipeline allows a negative pressure to be generated inside the sanitary appliance pipeline, the check valve port and the check valve block are automatically opened to supplement the air, thereby preventing the speed of the water flow at the later period of flushing from getting slower.