In order to satisfy the requirement for the ammunition replenishment of firepower weapons, a projectile rotation library suitable for ammunition delivery vehicles is designed. According to the composition structure and operation mode of the projectile rotation library, and 3D structure model is established. The dynamic method is used to analyze the stress state of the projectile rotation library of typical operating condition, and the transmission time and transmission accuracy of the ammunition are obtained through special calculation software, and the design requirements of the projectile rotation library are met through virtual prototype simulation. The simulation results show that the projectile transmission can be accomplished within a specified time with high transmission accuracy by adopting this scheme. And the result has certain reference value.