In order to solve the strength problem of interior high-speed permanent magnet motor at high speed, the rotor punch structure and the external carbon fiber banding of interior permanent magnet motor are comprehensively designed and studied. Finite element method is used to analyze the overall stiffness coordination deformation of the punch and carbon fiber sleeve, and the different effects of the carbon fiber binding preload on the initial binding state and highspeed operation are mainly considered. The relationship between the initial interference and the thickness of the binding layer and the static and dynamic stress distribution is analyzed, and the rules of the carbon fiber sleeve strength and the punch strength of the interior permanent magnet motor rotor under dynamic and static conditions are obtained.