The ADL-II automatic air duct production line is a particularly suited to total flange duct production equipment. The device uses the international popular profiles welded structure, synthesis on the rack and integrated leveler beading, red tip of the mouth side port device, Hydraulic Shears and computer control system. On the rack with synchronization support in the form, and to adapt to the internal diameter Φ480-610mm roll material. The computer control system with closed loop feedback to ensure a stable accuracy.