The rolling of large 40Cr13 stainless steel ring parts is a very complex process, and in the radial-axial rolling process, there are often problems such as instability, offset and abnormal shape of ring parts caused by the unreasonable parameter settings in the rolling process. Therefore, in order to resolve them, for the large-size ring parts with targeted outside diameter of Φ2952 mm, a four-stage rolling curve was designed, by selecting the key rolling parameters such as initial temperature of ring part, rotation speed of driving roller, and outer diameter increase speed of ring part in the rolling process, the rolling process was simulated by software Deform-3D, and the influences of different parameters on the rolling force, equivalent strain and temperature distributions were analyzed. The results show that under the four-stage rolling process, when the initial temperature is 1100 ℃, the rotation speed of driving roller is 20 r·min-1, and the outer diameter increase speed of ring part is 5.6 mm·s-1, the rolling force of finished ring part is appropriate, and the distributions of equivalence strain and temperature are uniform.