For solving problem of small amount of ammunition destruction, design mobile destruction system for grenades and minor-caliber shells. This paper analyzes decomposition of minor-caliber shell, stick grenade, and handle-less grenade. By adopting automatic control technology, automatic detection technology, and safety control measures, with optimum design on function integration of decomposing machine, all these functions have been completely actualized in the system which also ensures adequate operation and maintenance space. The practical application results show that the design guarantees reliability and safety of ammunition destruction, with good promotion prospects.