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1. An electric shunt valve with multi-stage flow control, comprising a controller, a brushless DC motor, a valve core and a valve body, wherein the valve core comprises a water inlet hole and a plurality of water outlet holes, and the valve body comprises a water inlet interface pipe and water outlet interface pipes corresponding to the water outlet holes one by one; wherein the electric shunt valve further comprising a PCB circuit board which is fixedly arranged, a light guide plate, a color sensor and a white LED lamp which are arranged on the PCB circuit board; the controller is electrically connected with the PCB circuit board and the brushless DC motor in turn, a rotating shaft of the brushless DC motor is detachably connected with the valve core through a connector; a color wheel is fixedly arranged on the rotating shaft, the light guide plate is positioned between the PCB circuit board and the color wheel; a light pipe A and a light pipe B are arranged on the light guide plate, and the light pipe A is positioned directly below the white LED lamp and the light pipe B is positioned directly below the color sensor; a white light of the white LED is irradiated onto the color wheel through the light pipe A, and a light of a corresponding color is reflected and transmitted to the color sensor through the light pipe B; the color sensor generates a corresponding electrical signal through the color of the received light and transmits the electrical signal to the PCB circuit board, and the PCB circuit board obtains an absolute position of the rotating shaft currently according to the received electrical signal and feeds the absolute position back to the controller; the controller controls the brushless DC motor to perform phase rotation to drive the connector and the valve core to selectively rotate forward and backward relative to the valve body, so as to realize multi-level control of water flow corresponding to the water outlet holes.
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