This experiment proposed one kind of 23 mm chainless feed box design to improve its space utilization, reduce the energy required to feed and improve reliability of the high-speed weapon ammunition system. The arrangement of chainless feeding conveyor units was changed and rearranged according to the existing feeding box design. The key changed part of the essential ammunition box was calculated. The simulation confirmation was conducted using the dynamics software ADAMS for the essential part. After improvement, the space utilization was increased by 50%, the equal ammunition feeding power loss was reduced by 54%, which greatly improved the feed system reliability. The design of key parts passed the ADAMS simulation test. The design can improve the property of the feeding box to a large extent and had certain significance for the design of high-speed weapon ammunition system in the future.