Line consists of a feeding metal frame, leveler grooving roller, hydraulic notch and punch square machine, hydraulic shearer and folder. The electrical control system uses a computer with a closed-loop servo-system to increase the precision and reliability of the line. The maximum working speed is 10m/min. The length tolerance is ±0. 5mm. The diagonal line tolerance is ±0. 8mm. The capacity of the manufacturing process will produce 1000m2 of square duct.