For improving the ammunition feeding ability, study the driving characteristic of the cannon drum shell-feeding device and its transfer characteristic. On the basis of the study of existing domestic and international feeding device, a feeding model is established for exterior cannon drum feeding device. Carry out rotating inertia calculation, and calculate the driving torque according to design movement principle. Based on theory analysis, carry out simulation analysis on cannon drum feeding, and select 5 bullets for transfer research. The simulation results show that the research can provide related design for reference.