In order to solve the problem of crack occurring in the middle boss fillet and claw cavity flllet of claw pole pre-forging die, a pre-forging composited die core was designed. The forging integral die core and composited die core of pre-forging for claw pole were numerically simulated by Deform-3D, and the structure parameters of the composited die core were optimized by the orthogonal experiment. The results show that the claw pole pre-forging composited die core is of better formability performance and lower die stress. The optimal structure parameters of composited die core are acquired with the convex core diameter 43 mm, the convex core angle 0°, the convex core interference fit 0.3 mm, die set interference fit 0.6 mm, and convex core height 47 mm. The pre-forging tests show that the crack of pre-forging die can be avoided by three-layer composited die core.