Abstract: Infrared testing (IRT) technology has the characteristics of non-contact, wide measurement range, intuitive imaging and so on. In this paper, firstly, through the experimental research on five kinds of key electrical components of three different types of elevators, such as circuit board, power supply, contactor, relay and terminal block, the corresponding infrared signal characteristic atlas is obtained, and then through the analysis of the temperature rise characteristics of different elevators, it is found that the thermal radiation characteristics of different types of electrical components are quite different, finally, the temperature difference discrimination method is used for evaluation and classification, the corresponding maintenance strategy is proposed and the application potential of IRT technology in image recognition and intelligent detection of elevator electrical components is pointed out.