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Aiming at the problem of surface defect detection of mirror-like transparent objects in industrial products, a detection method based on the combination of phase deflection and image processing was studied.The absolute phase of the reflected fringe pattern is solved by gray code and four-step phase shift method. The defect pattern can be visualized by converting the absolute phase to gradient.After analyzing the cause of the interference of the rear surface in the defect diagram, a method of image processing is proposed to eliminate the interference of the rear surface reflection.The method can retain the defect of the front surface and filter the interference of the rear surface.The experimental results show that the method proposed in this paper can detect the surface defects of mirror-like transparent objects, and the effect is much better than that of traditional open field detection.