Pipeline flange butt joint assembly

The utility model discloses a pipeline flange butt joint assembly which aims at solving the problems that in the prior art, a clamp is complex in structure, the applicable flange diameter range is very limited, and the clamp cannot be suitable for assembling flanges and flange pipes with different diameters. The technical problem is solved through the following technical scheme, the flange fixing device comprises a plurality of installation pipes, a flange lower positioning plate and a lower fixing flange pressing plate are arranged below the installation pipes, and a pair of upper fixing flange pressing plates are arranged above the installation pipes. Through mutual cooperation of the installation pipes, the installation pipes can be supported in the circumferential direction of the flange, the flange can be conveniently fixed, and therefore the pipeline is matched with the flange, and welding of the flange and the pipeline is facilitated; the flange connecting piece has the advantages of being easy to asse