Combined rolling is an advance plastic forming method combining the traditional ring rolling and three rollers cross-rolling technology to realize the precision forming of ball valve parts. Based on combined rolling, the evolution of recrystallization and the influence of rolling parameters on the forming process of ball valve parts were studied by the combination of finite element simulation and experimental verification. The results show that during the combined rolling process, the occurrence of dynamic recrystallization is related to the strain, and the speed of dynamic recrystallization is related to the temperature and deformation speed. In addition, the significant grain refinement is observed in most regions except the heart of metal. With the increasing of original rolling temperature, the grain size of rolling part increases and the uniformity of grain size is improved. However, with the increasing of feeding speed, the axial difference in grain size is more obvious, and the grain size becomes slightly large with a worse uniformity.