The invention relates to a construction method for connecting natural gas pipelines with gas, which comprises the following steps: excavating an operating spot groove at the selected spot; after excavating the groove to the given requirement, prefabricating stub pipes and junction valves of branch pipes, closing the valves on both sides of the operating spot, putting scattered pipes to reduce pressure, and observing the pressure in the pipes; after the pressure drops to the specified standard, drawing the opening position on the main pipe, carrying out oxweld cutting, removing the pipe wall, welding the prefabricated pipe sections, and replacing with new pipelines; after replacing with the new pipelines, detecting leakage with soap solution, carrying out anti-corrosion treatment at the joints, and restoring gas supply; and finally, laying a valve well, backfilling the pipe groove, and restoring the road surface, thereby completing the whole pipe connecting construction with gas. By using the invention, reliability, economical efficiency, safety and the like of the whole construction process are improved, and the whole construction process is simple in operation, less in preparation work, light in labor intensity and low in labor consumption. Each construction spot only needs about 5 persons, the construction only takes a half day and only needs common equipment, such as welders, electric drills, mobile phones and the like.