The utility model provides a pipeline plugging device, including plugging base, the capping, knob and elastic sealing element, plugging base is last to be equipped with annular arris, reference columnand connecting rod, the connecting rod passes capping and knob threaded connection, rotatory knob can change the distance between capping and the plugging base, elastic sealing element includes the closing plate of locating the plugging base below and locates annular arris outlying sealing ring, be equipped with annular lid eaves on the capping, the toper is personally submitted to annular lid eaves transversal, annular lid eaves card is between annular arris and sealing ring, the cover is equipped with the spring on the reference column, the upper end of reference column is equipped with thelimiting plate that is used for restricting distance between capping and the plugging base, ultimate range between capping and the plugging base is L1, minimum distance is L2, the height of annular lid eaves is L3, L1 L2 L3, no matter how the knob rotates, annular lid eaves is located between annular arris and the sealing ring always, need not the position that in use observed annular lid eaves,make pipeline plugging device's use more convenient, reliabl.