Abstract: The wind power generation is an important form of renewable energy generation and one of the strategic emerging industries with global competitiveness.Tthe capacity of single wind turbine is increasing, and the reliability of wind power converter is becoming more and more important. It is found that temperature has become the most important factor affecting the reliability of converter. In view of the frequent over breakdown temperature problem of wind power converters in the application process, the heating mechanism, failure mechanism and stability factors of the converters are deeply studied and analyzed, and the heat loss model is established. Through the research, it is found that the main reasons affecting the converter heating are converter body design, high working environment temperature, thermal resistance coefficient increase, insufficient ventilation, etc., and the solution is explored, which is of great significance to reduce the fault rate of wind power converter, upgrade the equipment, prolong the service life and maintain the converter.