The utility model discloses a control signal switching circuit of a motor controller, which comprises a power supply input module, a voltage transformation module, a rectification module and an air switch QF, the power supply input module is provided with a power supply input end VCC, and the power supply input end VCC is electrically connected with a switch K1; the output end of the power input end VCC is connected with a transformer T1, a transformer T2, a transformer T3 and a transformer T4 in parallel, the transformer T1 is electrically connected with the switch K2, the transformer T2 is electrically connected with the switch K3, the transformer T3 is electrically connected with the switch K4, and the transformer T4 is electrically connected with the switch K5. According to the controlsignal switching circuit of the motor controller, rapid switching of control signal types is realized through the switch K1, the switch K2, the switch K3, the switch K4 or the switch K5; an air switch QF is adopted, so that the device is convenient to use under the conditions of high temperature and high humidity; the overall control signal type can be quickly switched, the cost is low, and the device can be conveniently used under the conditions of high temperature and high humidity.