Bending mechanism for bending machine

The utility model relates to the technical field of pipe fitting bending machines, and discloses a bending mechanism for a bending machine, which comprises a working table and a moving table arranged on one side of the working table, and a first limiting groove is arranged in the working table. The two sets of limiting rollers and the bending rollers on the workbench and the position, inserted between the attaching block and the bending rollers, of one end of an external pipe fitting can be attached to the position between the attaching block and the bending rollers on the attaching block, and the outer surface of the other end of the pipe fitting and the two sets of limiting rollers are attached and blocked. When the top of the driving screw rod is rotated by external driving equipment, the attached pipe fittings can be rotationally bent, and when the pipe fittings with different diameters need to be machined, the movable screw rod can be used for shifting the limiting rollers at the top of the rotating belt