Opening aligning system for pipeline and flange

The utility model discloses an aligning system for a pipeline and a flange, and belongs to the field of long-distance pipeline welding. The aligning system for the pipeline and the flange comprises a fixing platform, a plurality of supporting parts and at least one positioning adjusting part. Before a to-be-aligned pipeline and a flange are welded, the pipeline is horizontally placed on the supporting part, the other end of the supporting part abuts against the side, close to the fixing platform, of the pipeline, and the flange is connected with the positioning adjusting part. The flange is driven to move in the first direction through the first adjusting piece in the positioning adjusting part, the flange is driven to move in the second direction through the second adjusting piece in the positioning adjusting part, the flange is driven to move in the third direction through the third adjusting piece in the positioning adjusting part, and the center line of the flange coincides with the center line of the pip