Large air pipe with flanged flange structure

The invention relates to the technical field of air pipes, and discloses a large air pipe with a flanging flange structure, which comprises two battens I and two battens II, the two battens I and the two battens II are spliced to form a pipe body, and the pipe body is provided with a flange. The two first battens are located on the left side and the right side of the pipe body correspondingly, the pipe body is formed by splicing the first battens and the second battens and then connecting the first battens and the second battens through bolts, and the top ends and the bottom ends of the first battens and the second battens are outwards provided with second folded edges, first folded edges, third folded edges and fourth folded edges correspondingly. The top and the bottom of the pipe body do not need to be additionally welded with battens to form flanges to be connected with other equipment or another pipe body, the first flange holes are formed in the second folded edge and the third folded edge, the second f