Butt joint pipeline assembly

The invention discloses a butt joint pipeline assembly, relates to the technical field of pipeline sealing, and is used for improving the sealing performance of a pipeline connection position under the condition that the space coaxiality of a connection pipeline is difficult to guarantee. The butt joint pipeline assembly comprises a first pipeline, a sealing gasket, a second pipeline and a jacket nut, and the first pipeline is provided with a through first cavity. The first cavity comprises a first cylindrical section and a second cylindrical section, and a limiting face is formed at the connecting position of the first cylindrical section and the second cylindrical section. The sealing gasket is provided with a first surface and a second surface; the first surface is limited on the limiting surface; the sealing gasket is provided with a second cavity, and the outer wall of the second cavity is a first arc-shaped face. The second pipeline is provided with a third cavity, a sealing part is arranged on the oute