Device for preventing leakage of natural gas pipeline

The utility model discloses a leakage-proof device for a natural gas pipeline. The leakage-proof device comprises a left pipeline and a right pipeline, the right pipeline is arranged at the right end of the left pipeline, and fixing plates are mounted on the inner sides of the right pipeline and the left pipeline; comprising supporting columns fixed to the upper end and the lower end of the inner side of a fixing plate, and an inner air bag for sealing a left pipeline penetrates through the left side of a right pipeline; the conveying pipe is arranged on the left side of the connecting pipe, the other end of the conveying pipe is connected to the outer side of the inner air bag, and a one-way valve for limiting the flowing direction of natural gas is arranged in the middle of the interior of the conveying pipe; and the hollow column is mounted on the left side of the right pipeline. According to the natural gas pipeline leakage prevention device, the piston, the alarm and the fixing ring are installed, the pi