This kind of structure vacuum tube is mainly designed for the transportation of high-risk low-temperature medium. The key of design is to avoid the direct contact between the vulnerable and fatigue key components on the pipeline and the high-risk low-temperature medium, and greatly reduce all kinds of welding, connection point. It basically avoids the risk of shortening product life and causing medium leakage caused by fatigue damage and artificial damage of structural components. It can also simplify the structure of inner pipe, reduce the number of welds and reduce the resistance of pipe system. The pipeline is treated scientifically, the appearance is beautiful, the surface is smooth, the pipeline service life is long, the anticorrosion is strong, the pipeline design according to the user demand, can be directly installed in the pipeline vacuum insulation cut-off valve, check valve, emergency shut-off valve, control valve, solenoid valve, gas-liquid separator.