Bending machine for steel door production

The utility model relates to the technical field of steel door bending, in particular to a bending machine for steel door production, which comprises a base and is characterized in that two supporting plates are fixed on the upper side of the base, a connecting shaft is rotatably connected between the two supporting plates and comprises a connecting plate and a clamping plate, a mounting groove is formed in one side of the connecting plate, and a clamping groove is formed in the other side of the connecting plate. A lower bent plate is inserted into the mounting groove, one side of the connecting plate penetrates through the mounting groove and is provided with an inserting opening, a limiting cylinder is fixed to the position, located at the inserting opening, of one side of the connecting plate, a through hole is formed in one side of the limiting cylinder, a connecting hole is formed in the position, located at the inserting opening, of one side of the lower bent plate, and an inserting rod is inserted int