Warm ventilation pipe based on edgefold reinforcement

A warm ventilation pipe based on flanging reinforcement is formed by bending a rectangular composite square plate, the composite square plate comprises two base plates and a sandwich material filled between the two base plates, a plurality of kerfs distributed in the length direction are cut in one of the base plates, the kerfs extend in the width direction, and the kerfs extend in the width direction. The part, located on one side of the kerf, of the base plate is bent to be perpendicular to the base plate to form a folded edge, a notch is formed between the folded edge and the part, located on the other side of the kerf, of the base plate, the part, corresponding to the notch, of the other base plate is bent to enable the composite square plate to define a warm ventilation pipe, and the folded edge is used for connecting two adjacent edges in the warm ventilation pipe. While the warm ventilation pipe is reinforced by the folded edges, subsequent flange installation is facilitated, and air leakage is not pro