In view of the shortcomings of the launch strength calculation, a numerical simulation analysis method is proposed. Through the analysis of the application method of mechanical simulation in the process of projectile launch, the establishment of the simulation model of launch strength and the selection of the type of analysis are explained, and the results of the strength parameters of the projectile at different times in the process of projectile launch are obtained. The calculated results are basically consistent with the experiments results. The results show that this method can provide a theoretical reference for the study of projectile launch strength.