Pipeline sealing device for natural gas pipeline

The utility model discloses a pipeline sealing device for a natural gas pipeline, which relates to the technical field of natural gas pipelines and comprises a sealing mechanism and a mounting mechanism. The sealing mechanism comprises a first pipeline, one end of the first pipeline is connected with a second pipeline, and the joint of the first pipeline and the second pipeline is sleeved with a lower fixing ring and an upper fixing ring; the mounting mechanism comprises a connecting seat and a mounting plate, the connecting seat is arranged at the bottom of the front surface of the upper fixing ring, the mounting plate is arranged at the top of the front surface of the lower fixing ring, a transmission groove is formed in the top end of the mounting plate, moving seats are slidably connected to two sides in the transmission groove, and clamping blocks are connected to the top ends of the moving seats; the sealing device has the advantages that the rotating disc is matched with the two-way lead screw, the two