The invention discloses an injection water-saving valve, which is arranged in a water tank of a
toilet stool and is used for feeding water into the water tank and pushing water current flowing into a
bed pan from the water tank of the
toilet stool. The injection water-saving valve comprises a water inlet
pipe, a water
inlet valve, an injection valve, a water inlet
siphon preventing valve, an injection
siphon preventing valve, an injection
pipe and a water outlet, wherein the water inlet
pipe is connected with an external
water source; the water
inlet valve and the injection valve are communicated with the water inlet pipe; the water inlet
siphon preventing valve is communicated with the water
inlet valve; the injection siphon preventing valve is communicated with the injection valve; the injection pipe is communicated with the injection siphon preventing valve; the water outlet is communicated with the water inlet siphon preventing valve and is used for draining water in the water tank; the injection valve is used for controlling the water injection to the middle or the bottom of the
toilet stool or the bottom of an inlet of a
sewage discharge pipeline; the water inlet valve is used for controlling water feeding to the water tank of the toilet stool and controlling the injection valve to be closed; when the water tank drains, the external
water source is directly injected to the middle or the bottom of the toilet stool or the bottom of the inlet of the
sewage discharge pipeline; and after the injection is carried out for 3-8 seconds, the injection valve is closed. According to the injection water-saving valve disclosed by the invention, water current drained from the water tank is pushed by the
water pressure of the external
water source to flush, so that the problem of high
water consumption is solved; and the injection water-saving valve has the advantages of low
water consumption,
automatic control, simpleness and convenience in mounting and low cost.