In order to improve the forming quality of W-ring, the ultrasonic vibration rolling process of W-ring was studied in this paper. Based on ABAQUS/Explicit finite element simulation software, a three-dimensional finite element model of W-ring with ultrasonic vibration assisted rolling was established, and the influence of ultrasonic frequency on the non-uniform deformation of the ring was studied. The results show that with the increase of ultrasonic frequency, the stress unevenness of the ring increases first and then decreases. The strain unevenness of the ring component decreases slightly first, then increases sharply, and then decreases again. The non-uniformity of wall thickness decreases first, then increases and then decreases. When the ultrasonic frequency is 30kHz and 40kHz, the unevenness of the ring deformation increases significantly, which is caused by the wrinkle phenomenon of the ring. By analyzing the stress, strain and wall thickness of the section, it is proved that the position of wave crest and trough is the key position in the forming process.