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There are a large number of controllers and components in the distribution cabinet and electrical box of industrial vehicles, involving a large number of connecting lines and interfaces, which are easy to produce defects such as virtual connection and short circuit in the process of production and commissioning, and there are huge hidden dangers in operation. The infrared heat detection technology of mobile phone terminal is studied to detect the abnormal heat in the initial stage of test run or operation of the equipment. The detection methods of knowledge base creation, image acquisition, image distance acquisition algorithm, image fusion parameter calibration algorithm, image fusion algorithm and heat detection calculation method are used to solve the problem of narrow detection space of the equipment on the vehicle and the detection based on portable equipment The difficulty of uncertainty of shooting distance and angle caused by measurement. The integrated equipment based on mobile phone camera and infrared camera is used for image detection. The temperature measurement accuracy is ± 2 ℃ and the position accuracy is ± 3 pixels, which meets the needs of abnormal heat detection of equipment on the vehicle.