Bending device for steel coil machining and using method thereof

The invention discloses a bending device for steel coil machining and a using method thereof, relates to the technical field of steel strip bending devices, and aims to solve the problems that in existing bending operation, steel coil strip head bending devices with corresponding widths and sizes need to be selected according to the widths of steel coils, and the production cost is increased due to the arrangement of steel coil strip head bending devices with multiple sizes; in order to solve the problem that clamping difficulty is increased when a large-size steel coil strip head bending device is used for clamping a narrow-width steel coil, a positioning mechanism is arranged between one sides of two upper clamping arms, lower clamping arms are arranged on the outer sides of the upper clamping arms, and a pressing mechanism is arranged between one sides of the upper ends of the two lower clamping arms. A pressing area is arranged in the middle of the lower end of the downward pressing mechanism, a pressing