The invention discloses an ultrasonic assistant gear axial rolling forming device. The problems of large radial rolling force, fast abrasion of rolling wheels, short service life of the rolling wheels, low machining efficiency and the like are mainly solved. The ultrasonic assistant gear axial rolling forming device is composed of a motor (1), a belt (2), a belt wheel (3), transmission shafts (4), radial adjusting hydraulic cylinders (5), rolling wheel supports (6), rolling wheels (7), an electromagnetic induction coil (8), an ultrasonic generator (9), an axial feed hydraulic cylinder (10), a transducer (11), a waveguide rod (12), a center device (13), a gear string (14), a worm (15), a driving shaft (16), an electromagnetic heating controller (17) and a worm wheel (18), wherein the center device (13) and the waveguide rod (12) of an ultrasonic vibration system are connected in a screw pre-tightening mode. Whether heating is performed or not, alternating current magnitude, ultrasonic vibration frequency and a rolling mode of the rolling wheels are determined according to a gear blank material and different forming modes, so that gear ultrasonic precise rolling forming is achieved. By means of the ultrasonic assistant gear axial rolling forming device, the rolling force can be effectively reduced, the service life of the rolling wheel is prolonged, moreover the surface roughness of wheel teeth can be decreased, and the machining efficiency is improved.