Aiming at the characteristics of large-diameter bullet forming automatic assembly production with large pressure resultant force, the large-diameter rotor-type technology of bullet knot is proposed. Use the small diameter bullet rotor-type production mode and production technology, according to the working principle of the large-diameter rotor-type technology of bullet knot and analyzes the measures for improvement of the cycle time and quality of the product, calculates the force and required power of the cam in the device, and conducts the strength analysis. The analysis results show that the feasibility of the development is proved theoretically by demonstrating the large-diameter rotor-type bullet knot equipment.