Abstract: A water level switch device comprises a main control board, a water container, a water feeding pipe communicated with the water container, and a water feeding valve provided on the water feeding pipe, the water feeding valve communicated with a water supply source, wherein a water level switch is further provided inside the water container; the water level switch is fixedly arranged inside the water container, and each of selectable water levels inside the water container corresponds to one of detection sites of the water level switch; the main control board comprises an MCU, a liquid crystal screen used for displaying a current water level parameter and a water level parameter setting page, and a control button used for setting a desired water level, and the control button, the liquid crystal screen, the water level switch and the water feeding valve are all connected to the MCU by signal lines.