Pipeline system capable of continuously supplying gas for long time

The utility model provides a pipeline system capable of continuously supplying gas for a long time, which is provided with at least two gas source branches, each gas source branch is provided with a stop valve and a gas supply pipeline pressure reducing valve, a gas switching valve is arranged between every two gas source branches, two gas monitoring meters are arranged on the gas supply pipeline pressure reducing valve, and the gas monitoring meters are connected with the stop valve. The gas switching valve is connected with a use carrier main valve through a pipeline, a stop valve is arranged in the pipeline for connecting the gas switching valve and the use carrier main valve, the use carrier main valve is connected with a plurality of use carrier branches, and use carrier branch pressure reducing valves are arranged on the use carrier branches. A plurality of gas source branches are provided at the same time, free switching of different paths of gas is achieved through the gas switching valves, continuous