Abstract: The planetary carrier is the most stressed part in the planetary reducer. It must have sufficient strength and stiffness to evenly distribute the planetary gear load and transmit all power to the shaft. At present, it is mostly produced by round bar turning and split welding, but its processing efficiency is low and the cost is high. It is very difficult to process the four square holes in the circumferential direction of the end. In this paper, a new hollow multidirectional forging process is proposed to improve the efficiency and reduce the cost. According to the structural characteristics of the planetary carrier, the hollow multidirectional forging process is formulated, the forming process is simulated and analyzed by DEFORM-3D, and the metal flow law, equivalent stress distribution and load-time curve are analyzed. Finally, the corresponding die structure is designed and the process test is carried out according to the simulation results. The results show that in the multi-directional split forming process of planetary carrier, the metal flow is relatively stable, the maximum load is 5.94 ×10⁶ N, the die is within the allowable stress range, the metal streamline is basically distributed along the contour of the part, and the forging size obtained from the process test meets the design requirements. It shows that the hollow multi-directional forging process and die structure of planetary gear carrier designed in this paper are feasible, which plays a certain guiding role in the mass production of this kind of parts.