Aiming at the problem that the temperature field analysis modeling is difficult due to the irregular air gap between the two windings in the stator slot of the switched reluctance motor, an improved modeling method for the double winding air gap is proposed. The calculation method of the total cross-sectional area of the air gap between the two windings of the motor is analyzed. The model structure of the double-winding air gap and the method for determining the optimal air gap width are studied. Based on this, a threedimensional finite element model of the switched reluctance motor is established. The temperature field is analyzed by finite element method, and the temperature field distribution of the switched reluctance motor is obtained. The temperature field under different air gap width is analyzed and the numerical fitting method is used to obtain the air gap width and the corresponding temperature. The function relationship, using the function relationship and the corresponding measured temperature value, can obtain the optimal air gap width of the double-winding air gap model. This method effectively improves the accuracy of the temperature field analysis results of the switched reluctance motor, it has a good application value.