The invention provides a cold-bending forming process for an open type elastic limiting clamping ring. The straight-line segments of the two ends are prebent before bending forming in the perpendicular fiber direction of a plate, and thus the radians of the ends reach the diameter size of the elastic limiting clamping ring in advance. Circular arcs at the closed opening positions of the two ends of the open type elastic limiting clamping ring are subjected to punch forming in advance, then the whole plate is bent, thus the problem of the straight-line segments left at closed openings can be solved, smooth transition of the inner diameter surface of the open type elastic limiting clamping ring is ensured, finally the elastic limiting clamping ring meets the design requirements, and the problem of difficult forming of the open type elastic limiting clamping ring is solved completely.