The utility model provides a step collision bead which comprises a cylindrical shell, a ball and a spring, one end of the cylindrical shell is an open end, the other end of the cylindrical shell is a closed end, an annular clamping groove is formed in the inner side of the open end of the cylindrical shell, an annular check ring is integrally arranged on the outer side of the open end of the cylindrical shell, and the spring is arranged in the annular clamping groove. The ball is rotatably clamped in the annular clamping groove, the ball is opposite to the cylindrical shell and protrudes out of the annular clamping groove, and the spring is installed in the cylindrical shell. According to the step collision bead, through the combined design of the cylindrical shell, the ball and the spring, stable rotating positioning of the ball in the annular clamping groove is achieved, meanwhile, under the combined action of the T-shaped guide block, the supporting block and the limiting sleeve, the spring can stably and effectively support the ball, and therefore the stability of the step collision bead is improved. And the overall stability, adaptability and durability of the step collision bead are further improved. The design is suitable for various furniture accessories, automobile accessories and other occasions needing positioning or guiding.