Coil machine with adjustable inner diameter

The utility model relates to the technical field of loose-leaf notebook accessories, in particular to an inner diameter adjustable coil machine which comprises a base, an adjusting mechanism is arranged above the base and comprises a rotating motor, the rotating motor is fixedly connected with the surface of the right side of a supporting frame, and an output shaft of the rotating motor is coaxially connected with a rotating disc. Mounting rods are symmetrically welded and fixed to the positions, close to the upper side and the lower side, of the right side surface of the rotating disc, a plurality of first stamping plates are welded and fixed to the circumferential outer wall of the lower mounting rod, a plurality of second stamping plates are welded and fixed to the circumferential outer wall of the upper mounting rod, and a fixing mechanism is arranged at the position, close to the rear side, of the top of the base; according to the coil machine with the adjustable inner diameter, by arranging the adjustin