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Taking stamping parts as an example, according to the consistency of components on the conveyor belt, we introduce a design of visual algorithm for guiding parallel manipulator to pick components from the conveyor belt. We use a non-matching algorithm, by which position and angle of components on the conveyor belt can be fast calculated. Compared with template matching method, this algorithm has greatly reduced computing time, which ensures the real-time performance of the system. In addition, the algorithm also deals with reversal and overlapping phenomenon of components. According to the information obtained by visual algorithm, angle of driving arm of the manipulator can be calculated, and the pick-and-place operation can be realized. We tested 30,0 components, except for 43 overlapping ones, and 28 not-correctly-recognized ones, the algorithm has the correct rate of 99.7%, which prove that the algorithm has high reliability.