The invention belongs to the field of motor rotor manufacturing, and particularly relates to a high-speed
permanent magnet synchronous motor composite rotor spiral winding preparation method which comprises the following steps: preparing a composite magnetic material; adhering the inner surface of the permanent
magnet to the surface of the motor spindle; connecting and mounting circular truncatedcone
metal supporting pieces at two ends of the permanent
magnet; continuously and spirally winding multiple
layers of prepared composite magnetic materials on the outer surface of the carbon
fiber ofthe permanent
magnet in the circumferential direction, and applying a pre-tightening force in the winding process; and after winding of the composite magnetic material is completed, continuously performing winding at the surface of the composite magnetic material to form a carbon
fiber protective sleeve, then performing curing, cleaning, circular truncated cone
metal supporting piece dismountingand turning treatment sequentially, and preparing the composite rotor. In the spiral winding process, it can be guaranteed that each layer of
magnetic powder adhesive film is evenly distributed, particularly, the problem of interlayer continuous winding can be solved, and the problem that due to continuous winding, the end of the rotating shaft is wrinkled in a winding mode or time is wasted in the
cutting and re-winding process is fundamentally solved.