The utility model relates to a large-scale gear cogging machine tool, which belongs to the field of machine tool technology. The large-scale gear cogging machine tool comprises a frame, screws arranged on both sides of the frame, a starting motor arranged on the bottom of the frame, a sliding frame capable of being driven by the starting motor to slide up and down along the screws, and a cutting motor and cutter discs respectively arranged on both sides of the sliding frame, wherein the arrangement angles of the two cutter discs are so arranged that the remaining part of a cut gear workpiece has a triangular shape. The large-scale gear cogging machine tool changes the large-gear hobbing process into cutting, cogging and hobbing processes, so that the work efficiency for large gear processing is improved greatly, the abrasion of cutter is reduced, and the processing cost is reduced.