In order to meet the test requirements of the external ballistic force of the spinning projectile, a motion control system of the projectile external ballistic test device is designed. Taking Beckhoff CX5130 motion controller as the main controller, by controlling the motion of the test device to drive the projectile rotation and swing, the exterior ballistic motion simulation function of the rotating projectile is realized. The results show that the system can achieve the expected design goals, and has been verified in application.