The invention provides a variable frequency speed regulating three-phase asynchronous motor. The motor includes a shell, a stator, a rotor, a front end cover, a rear end cover, a heat dissipation fan,a fan housing, a frequency conversion control device and a circuit board. The heat dissipation fan is an axial flow fan and is fixed to a rotor shaft. The circuit board is arranged on the rear end cover. The fan housing covers the rear end cover. The stator adopts a single-layer and double-layer mixed winding. A neutral point of the single-layer and double-layer mixed winding is grounded by a capacitor and a resistor connected in series. The capacitor and the resistor are arranged on the circuit board. The variable frequency speed regulating three-phase asynchronous motor adopts the novel single-layer and double-layer mixed low-harmonic winding to effectively remove or weaken phase-band harmonics. Meanwhile, the single-layer and double-layer mixed winding used by the invention can save winding and simplify a winding process.