Preparation method of high-efficiency explosion composite pipes and bars in local vacuum environment

The invention provides a preparation method of high-efficiency explosion composite pipes and bars in a local vacuum environment. The preparation method comprises the following steps: coaxially arranging a first to-be-composited bar material, a second to-be-composited pipe material, a third to-be-composited pipe material and a fourth to-be-composited pipe material from inside to outside; enabling the position between the second to-be-compounded pipe material and the third to-be-compounded pipe material to be filled with explosive and a detonator to form an explosive device; sealing and vacuumizing the two ends of a gap between the first to-be-compounded bar material and the second to-be-compounded pipe material as well as the gap between the third to-be-compounded pipe material and the fourth to-be-compounded pipe material by using sealing strips to form a vacuum gap environment; and detonating the explosive device, and welding the to-be-compounded material by utilizing high pressure of explosive explosion to