Infrared diagnosis technology is a new type of diagnosis technology, which provides a good diagnosis method for thermal diagnosis of substation equipment. During the detection, at the same time, this diagnostic technology can also be used in combination with other detection methods to locate the specific location of the fault, which can effectively improve the convenience of maintenance. However, there are various factors that affect the accuracy of infrared thermal imaging diagnostic technology. When making a diagnosis, it is necessary to control the measurement environment and measurement method reasonably.