The invention relates to a flushing device, in particular to an external disk-piston diaphragm energy storage toilet flusher widely used in residents' homes. It includes: water inlet pipe, small water tank, base, gasket, cover plate, screw, pressure rod, diaphragm, pressure rod return spring, valve cover, cylindrical faucet cover, valve cover center column, cylindrical faucet cover reset Spring, water sealing piston, pressure guide hole of cylindrical faucet cover, link spring, throttle hole, faucet pressure relief hole, cylindrical faucet cover sealing rubber block, mounting bolts, flusher drain, drive disk, water Mouth, small water tank pressure ring, small water tank sealing ring. Driven by the magnetic force of the magnetic disk, the water sealing piston of the flusher opens, and the high-energy water accumulated in the small water tank is jointly promoted by the air and the diaphragm, and is injected into the toilet seat at a high speed, flushing the dirt at a high speed, while ensuring the flushing effect. At the same time, it can greatly save water and reduce duplication of labor.