For the structural characteristics of large-size involute ring gears, combining the characteristics of fine blanking process, the technical difficulties of manufacturing technology for fine blanking gear were analyzed, and a fine blanking die was designed. Then, a convex reverse pressure plate structure and a narrow side die structure were specifically developed to fulfill the three-directional compressive stress required in the fine blanking process. Based on the structure characteristics of convex reverse pressure plate and narrow side die, the numerical simulation experiments of the large-size involute ring gear and the manufacturing experiments of fine blanking gear  were carried out, and the processed parts were tested. The results show that the shear surface of large-size involute ring gear processed by fine blanking has no tearing, and under the action of three-directional compressive stress, the material in the deformation zone of tooth undergoes large plastic deformation resulting in work hardening to greatly improve the hardness and abrasion performance of teeth. The surface hardness of root for tooth of processed ring gear parts reaches 384 HV, and the surface hardness of tooth side is lower than that of tooth root with the maximum hardness of 344 HV. In addition, the teeth of ring gear parts have the higher residual compressive stress through fine blanking, which improves the fatigue resistance of teeth for part and effectively increases the service life of parts. Finally, the tangential residual compressive stress of teeth for part is 290.4 MPa, and the axial residual compressive stress is 455.6 MPa.