Automatic air duct production line V is made up of the loading frame, the leveling and pressing machine, the punching tip and the punching port hydraulic press, the hydraulic shearing machine, the displacement joint corner biting machine, and the double-machine linkage self-forming flange machine. TDF hydraulic folding machine and automatic computer control system. The machine features small footprint, straight-line processing, high production efficiency, and can manufacture small-section "□" word ducts. Its smallest cross-section can be as small as 200 × 300mm common plate flange duct.