Roll seaming force directly affects the sealing safety in the process of ammunition fuses metal cans packaging. Based on the mechanics analysis and formula derivation of the head edge roller in the process of the metal cans crimping and sealing, the factors affecting roll sealing force were analyzed and summarized. Through the seaming force calculation and computer analysis of the head roller, consistency of the results was verified and the roll sealing force influencing factors became more credible. The purpose was to provide theoretical basis for the design and optimization of roller's groove curve, as well as the further research and calculation of deformed metal cans.