The invention relates to a switching and speed regulating method for permanent magnet motor coils. The switching and speed regulating method comprises the following steps of a switching circuit is added between a motor driver and a motor, wherein the switching circuit comprises multiple changeover switches; leading multiple taps out of the motor stator coils to be connected with the changeover switches; changing winding connection ways through the changeover switches, and then transmitting three-phase power to the motor, wherein the winding connection ways comprise a star connection way and a triangular connection way; the star connection way and the triangular connection way comprise low-speed gears and high-speed gears formed by serial connection or parallel connection of the multiple stator coils, or a combination of serial connection and parallel connection of the multiple stator coils respectively; and the high-speed gears are realized by increasing the number of each group of parallel-connection branches on the basis of the low-speed gears. According to the switching and speed regulating method, independent step speed regulation can be realized; meanwhile, step-less speed regulation with a higher speed regulation range also can be realized based on the basis of the speed regulation methods of frequency conversion, pressure regulation, flux weakening, and the like; and therefore, the permanent magnet motor can be wider in the speed regulation range and the volume of the permanent magnet motor is decreased, so that the production cost of the motor is greatly lowered.