WATER-SAVING TOILET WATER TANK

The utility model discloses a water-saving toilet water tank. A one-stage or multi-stage air pressure water chamber is arranged inside the box body of the water-saving toilet water tank. The water-saving toilet water tank is composed of an upper and a lower half shells, wherein, the top surface of the upper half shell (10) is provided with a water inlet (1), an air supplying hole (8) and a lifting rod guide holder (2), and the outer side of the top surface is fixed with a lever system. A funnel (12) is arranged inside the lower half shell (20), and the lower mouth of the funnel is slightly higher than the water outlet (21) of the water tank; the lower part of the water outlet is provided with a water flow back flushing chamber (4) whose bottom is provided with a nozzle (15) covered with a valve (14). Flushing water flushes toilet under the three actions of air pressure, water power and back flushing, so that the utility model has appreciable water-saving effect.