The utility model relates to a pipeline sealing air bag which is convenient to carry, space saving and economical. The pipeline sealing bag comprises a pipeline sealing bag body and an air intake port, and the air intake port is connected to the pipeline sealing bag body through a flange; The inlet and outlet air port is provided with two valves, one air port is connected to the barometer, and the other air port is used to connect the inflation equipment; The pipeline sealing air bag has a cylindrical shape, and the pipeline sealing air bag body is made of rubber dam special cloth. The utility model has the advantages of light weight, simple handling and convenient collection; It is made of environmentally friendly materials and can be treated as general waste. Anti-wear, can be reused many times; The operation time is short and the operation cost is low when the pipeline is blocked.