Aiming at the special structure of hybrid excitation flux switching linear magnetic suspension motor (HEFSLMSM), the temperature rise characteristics under different working conditions are analyzed deeply. The structure and operating principle of HEFSLMSM are studied. Three-dimensional steady-state temperature field mathematical model and boundary condition equation are established. Considering the heat exchange of each part of the motor, the thermal conductivity of each material and the convective heat transfer coefficient of different parts of the motor are determined. The copper loss and iron loss of the motor are calculated by using the finite element method, and the corresponding heat of formation is obtained. The temperature variation under the condition of no load and load with natural heat dissipation is calculated in the finite element software. The cooling system is designed on the basis of the original model, and the temperature field distribution under different working conditions after the installation of the cooling device is calculated respectively. The rationality and feasibility of the cooling device are proved by comparing the temperature of natural air cooling with forced water cooling.