Water mixing device for automatic constant-temperature water mixing valve

The invention discloses a water mixing device for an automatic constant-temperature water mixing valve. The water mixing device comprises a cold water inlet, a hot water inlet, a mixing chamber, a mixed water outlet and a water current vortex generator, wherein cold water and hot water flow into the water current vortex generator from the cold water inlet and the hot water outlet respectively to generate spiral movement and generate vortex movement in the mixing chamber, so that the cold water and the hot water are uniformly mixed quickly. A vortex water mixer for the automatic constant-temperature water mixing valve, disclosed by the invention, has the advantages of small size, low cost and simple structure, and ensures that a temperature sensor of an automatic constant-temperature water mixing valve correctly reflects the temperature of uniformly-mixed cold water and hot water. By adopting the automatic constant-temperature water mixing valve adopting the water mixing device, the phenomenon of variable temperature of drained water is overcome.