For satisfying manufacturing technique requirements of mainstream caliber bullet, based on civil packaging technology, the author researches and develops the bullet automatic packaging device which can meet manufacturing technique requirements of mainstream caliber bullet. Carry out theory research such as model establishment, control, system diagnosis on vertical pneumatic servo of bullet package clamping device, establish electronics-pneumatic switch servo system by gas circuit design and control of high-speed electromagnetic valve on cylinder. Combine them with control curve to realize application on practical device, analyze by test verification and test data. The result shows that the equipment can realize pneumatic position self-adjust and vertical location of clamping device of pneumatic servo at last, for better improving pneumatic servo technology, realizing replacement electronics servo with pneumatic servo and more widely application.