The invention discloses a rotary traction pin assembly. The rotary traction pin assembly comprises a rotary pin housing, a traction pin provided with a clamping groove, a rotary outer clamp movably sleeving the traction pin, and a motor for driving the rotary outer clamp to rotate, wherein the lower end of the traction pin is connected with the rotary pin housing, and a clamping groove is formed in the upper end of the traction pin; the upper end surface located at the upper end of the traction pin, of the clamping groove, is opened, and the sidewall located at the upper end of the traction pin, of the clamping groove, is provided with an inlet-outlet; the traction pin and the rotary outer clamp are in coaxial fit; and the motor drives the rotary outer clamp to rotate around the traction pin, so that exposure or coverage for the inlet-outlet is realized. The rotary traction pin assembly disclosed by the invention is simpler and low in cost by adopting the abovementioned structure; a material vehicle is simple in transformation structure, less in transformation expense, and short in transformation time; and popularization and use for an AGV in a large scale are benefited.