Through the analysis of different heating methods, combined with the structural characteristics and production procedures of wind turbine parts to be assembled, the resonant power heating technology was researched and implemented.There is a certain clearance between the inner and outer rings of the main bearing and the roller, so it is necessary to control the temperature difference between the inner and outer rings during heating. By studying the heating principle and method, combined with the parameters of the products to be heated, the one driving two full digital IGBT resonant power supply heating equipment was developed. The results show that by using the designed equipment, the problems of slow bearing heating speed and low temperature control accuracy in the current wind turbine manufacturing process can be effectively solved.