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This paper designs an industrial robot automatic assembly system which solves the problem of traditional star wheel manual assembly inefficiencies,after analyzing the assembly processing of the star wheel. Firstly, the star wheel surface profile image was captured by using CCD camera.Then, camera calibration was achieved with the help of Open CV visual library. Afterwards,the Noncontact visual inspection is implemented with the help of vision technology such as noise removal,Hough circle detection, contour extraction. At last,in the case of a star wheel,the experiment verifies the effectiveness of the detection method and the industrial robot realizes the automatic assembly processing based on the information obtained by the visual detection system.