In order to disassemble and destroy ammunition safely, the disassembly system of small caliber discarded shells was studied. According to the basic information of ammunition disassembly, according to the reverse sequence of ammunition production and assembly, the main technical problems of ammunition disassembly device are analyzed, the disassembly mode of ammunition components is determined. In order to solve the problems of “slipping” in the spin-off fuse system, problems with the propellant system and the control system, propose the way to deal with the primer and the requirements of the central control system. The research solves the problem of the large backlog of to-be-processed projectiles, improves work efficiency, and has high safety in production work.