Abstract: For the foil oiling system of GDX500 packing machine, the original machine lacks detection device, and its control is short of precision. A set of automatic detection device is designed to realize the accurate control of the starting circuit. For the minor differences between oiling aluminum foil paper and non-oiled foil, ordinary detection method is difficult to identify. Based on the emerging machine vision technology, a series of analysis and optimization were made for the system structure, image processing, detection algorithm and original machine procedures, and MATLAB software programming and simulation processing on part of the process were used, and satisfactory results were obtained.