In the mass production of high-tech industries need, the demand for the machine electrical equipment has been considerable running and relying. While the exceptional errors occur on the machine electrical equipment, the production process will be intercepted and affect the production capacity; in addition, process interruptions may endanger the safety of operations. In this study, the wet-process electrical equipment in the printed circuit board industry, the detecting technology of the Infrared Thermograph analyzes the reason why the wet-process electrical equipment often gets abnormal failure. Furthermore, the study finalizes the technology of the Infrared Thermograph and builds a predictive maintenance of the machine electrical equipment to establish the system of failure prevention. On the other hand, this can be the guideline to maintain the machine electrical equipment.