The invention discloses a powder metallurgy die for an automobile clutch disc hub. The powder metallurgy die comprises a two-flap circular puncher pin and a middle die, wherein the two-flap circular puncher pin consists of two symmetric halves; each half is provided with an involute outer spline; the intervals between the tops of spline teeth of the involute outer splines and the middle die are 0.01 millimeter; the intervals between the roots of spline teeth of the involute outer splines and the middle die are 0.02 millimeter; the intervals between connecting surfaces between the tops of the spline teeth of the involute outer splines and the roots of the spline teeth and the middle die are 0.02 millimeter. By adopting the die disclosed by the invention, the problem of easiness in deformation of the puncher pin of the die is solved.