In order to solve the problem that the connecting rod driven recoil device can not meet the requirements of manufacturing various cartridge cases, a new type of backflushing device transmission mechanism was designed. According to the technological requirements of cartridge case backflushing, the motion mechanism of the backflushing slider is analyzed in depth, the mathematical model of the conjugate cam driving mechanism is constructed, and a design example of a new backflushing device is given, and the motion analysis of the backflushing slider component of the new device is carried out. The analysis results show that the device can better meet the requirements of the backwash process, effectively reduce the impact of the backwash force on the bottom of the cartridge case, and meet the needs of single-machine equipment to produce multiple types of cartridge cases.