The duct production line I produced by our company is composed of a feeding rack, a leveling and beading device, a punch tip, a square mouth mold, a hydraulic system, and a computer control system. The electrical control part adopts computer control. The control system has a closed-loop feedback system, dual-encoding positioning, and the production accuracy and speed are obviously improved. Its maximum working speed is 16 m/min. The length error is 0.5mm soil, and the diagonal soil 0.8mm. This book meets the production capacity of 1000m? square air duct.