Abstract: As the core component of heat exchange, the quality of corrugated plate of plate heat exchanger directly affects the performance of the equipment. At present, the widely used manual detection in China, combined with the discrete methods such as dial indicator measurement and handheld ultrasonic detection, lacks a systematic detection scheme for the high incidence defects such as thickness thinning and microcracks in the manufacturing process, which has the problems of low efficiency, poor accuracy and insufficient sampling coverage. In order to solve the above problems, a high-precision double laser displacement sensor array and a reasonable mechanical follow-up mechanism were designed. The heat exchanger plate data were obtained by symmetrical progressive scanning. Combined with the geometric algorithm, the three-dimensional surface morphology reconstruction and the actual thickness calculation were realized, and the whole plate surface quality detection was completed. The experimental verification shows that the detection accuracy of the ripple depth of the monitoring system is±5μm, the detection accuracy can reach 0.01 mm, and the detection accuracy can reach 0.5 mm×0.5 mm dot matrix scanning of 100% of the whole plate surface. It can accurately identify pressing defects and other problems, significantly improve the detection efficiency and accuracy, promote the intelligent detection transformation of the heat exchanger manufacturing industry, and provide innovative solutions for the quality control of process industrial equipment.