The invention relates to a motor control circuit, which comprises an AC zero-crossing detection module, a rotor position detection module, a logic signal processing module and a motor winding switching module, wherein the AC zero-crossing detection module is used for detecting whether alternating current of a driving motor is positive or negative and a voltage zero-crossing state and outputting anAC zero-crossing signal (SYN) indicating the current state of the alternating current; the rotor position detection module is used for detecting the current position of a motor rotor and outputting arotor position signal (HALL) indicating the rotor position; the logic signal processing module is used for receiving the AC zero-crossing signal and the rotor position signal and outputting a motor driving signal (MOTOR) based on the two signals; the motor winding switching module is used for receiving the motor driving signal and controlling the current flowing through an excitation winding of amotor stator according to the received motor driving signal so as to enable an excitation magnetic field generated by the stator excitation winding to always drive the rotor to rotate along a fixed direction; and the logic signal processing module generates the motor driving signal through a logic gate chip or generates the motor driving signal by using a signal logic relation among one or more basic electronic components.