A motor driving circuit and a motor component are provided. The motor driving circuit includes: a bidirectional alternating current switch connected in series with a motor across two terminals of an external alternating current power supply, where the bidirectional alternating current switch is connected between a first node and a second node; a rectifying circuit having a first input terminal and a second input terminal; a first voltage drop circuit connected between the first input terminal of the rectifying circuit and the first node; a switch control circuit connected between a control terminal of the bidirectional alternating current switch and an output terminal of the rectifying circuit; and a magnetic sensor, where an output terminal of the magnetic sensor is connected to a control terminal of the switch control circuit, and the magnetic sensor is configured to detect a magnetic field of a rotor of the motor and output a corresponding magnetic inductive signal. In this way, the motor with the motor driving circuit starts to rotate in a fixed direction every time the rotor is powered on.