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In order to study the motion law and dynamic characteristics of a certain type of submachine gun automaton, and further explore the influence of the size of air guide hole on the motion cycle of the automaton, the three-dimensional solid model of the gun automaton was first established using UG software, then the virtual prototype was built in ADAMS software, and the internal trajectory and air guide chamber pressure curve were fitted using MATLAB software. The single shot of the gun was simulated, and the dynamic characteristics of the gun and the gun frame, such as displacement velocity curve and compound spring pressure curve, were obtained. The simulation results were compared with the test data, indicating that the virtual prototype model has a high feasibility. Finally, the simulation analyzed the influence of the size of the pilot hole on the motion cycle of the automaton. The recoil speed and recoil impact are increased, the recoil speed is significantly increased, the recoil time is significantly reduced, and the automatic cycle time is relatively reduced, which provides a theoretical reference for product optimization design.