In order to solve the problem that the die is easily damaged due to the large die forging force during the hot die forging of a gearbox gear， for a SCr420H steel deep wheel spoke tooth blank， a finite element simulation model of multi-station closed-die hot precision forging process for deep wheel spoke tooth blank was constructed based on Deform-3D， and the reliability of the model was verified. Then， the material flow and stress-strain distribution during the multi-station closed-die hot precision forging process were analyzed， and the unreasonable aspects of the die structure design were determined. Furthermore， based on orthogonal experiments， the influences of die structure parameters， such as draft angle and fillet radius， on the die forging force in closed-die hot precision forging were investigated， and the optimal die structure parameters combination was obtained. The experimental results show that in the transition region of the large deformation area， the unreasonable die structure produces obvious material flow velocity differences， resulting in the increasing of die forging forces. Changing the draft angle and fillet radius in this region improves the material flow velocity and reduces the material flow resistance. Thus， the optimized die effectively reduces the die forging force during forming.