Friction stir welding technology has become the manufacturing trend of launch vehicle aluminum tank due to the characteristics of less weld defects, small welding deformation, high joint performance, and so on. This paper analyzes the rocket tank structure composition and the main weld structure characteristics, and systematically studied all the key technologies used to realize the all-friction-stir-welded tank manufacturing, including conventional friction stir welding technology, phased array ultrasonic inspection technology and repair welding technology. The results of this paper has been gradually applied to the longitudinal weld, the main weld of the dome, and the circumferential weld of the launch vehicle tank.