The flow-forming forming machine is disclosed. Flow forming the molding machine according to this embodiment, with the rotatable mandrel by the mandrel drive unit, the center possible tail stock rotated by the tail stock driving, to the mandrel and can be in contact with the side of the workpiece which is rotatably supported by the tail stock in the flow-forming molding machine comprising a spinning roller to flow forming the workpiece, the mandrel, the mandrel body; For by pushing the workpiece at completion of the workpiece to exit from the mandrel body, the pushing block is coupled to the mandrel body so as to be movable in a direction approaching or spacing to the mandrel body; And characterized by comprising a core block of a ring shape coupled so as to be replaced in the pushing block to correspond to the shape change of the workpiece to be formed, doedoe coupled to the pushing block. According to this embodiment, but combining the core block to be replaced on the pushing block being a core block coupling having a shape corresponding to the spokes back surface shape of the aluminum wheel edge end is in contact with the edge end portion of the mandrel body, aluminum wheels but it is of the same diameter can be used to replace only the core blocks without replacing the entire mandrel when the rear spoke-like change, so there are economic advantages that can be shared use by the other components.