Three-input constant-temperature water mixing valve

The invention relates to the technical field of water mixing valves, and discloses a three-input constant-temperature water mixing valve. Comprising a protective shell, a three-input water mixing and distributing structure, a two-input constant-temperature water mixing structure and a water temperature synchronous adjusting structure. The three input sources are respectively a hot water source, a water source A and a cold water source. And the water temperature synchronous adjusting structure keeps the water temperature set values of the two-input constant-temperature water mixing structure and the three-input water mixing and shunting structure to be synchronously adjusted to be T. The three-input water mixing and shunting structure mixes water of a water source A with a hot water source to form water with the temperature higher than T, and the water is output through an internal water pipe B; meanwhile, water of the A water source is mixed with a cold water source to form water with the temperature smaller