The oblate spherical powder is an important power source of sniper ammunition, the consistency ofthickness is directly related to the ballistic performance of the projectile. At present, the extrusion molding process of the oblate spherical powder is all applied in rubber industry. Although the functional extrusion can be achieved, there are some problems such as low extrusion accuracy and poor molding consistency. Aiming at the above problems, a set of extruding machine roll distance accurate adjustment system based on particle swarm optimization terminal sliding mode （PSO-TSM） is developed. In this system, particle swarm optimization (PSO) algorithm is used to optimize multiple parameters in terminal sliding mode (TSM) controller iteratively, so as to achieve accurate adjustment of roll distance and improve the consistency of arc thickness. It is verified by extrusion test that the thickness error of the oblate spherical powder is controlled within ±0.02 mm, and the pass rate of extrusion reaches more than 95%.