The invention relates to a composite die seat round cutter machine, comprising a casing, a receiving/blanking shaft mechanism, a locking block mechanism, a roller shutter mechanism and a transmissionmechanism; the receiving/blanking shaft passes through the casing; the external end of the receiving/blanking shaft is arranged on a movable installation plate and the internal end of the receiving/blanking shaft is arranged on a bearing sleeve locking block; the tail of the receiving/blanking shaft is provided with a servo motor; the bottom of the receiving/blanking shaft is provided with a sliding block and a large seat plate which can move inside the stroke of the transmission mechanism; the large seat plate is arranged at the rear part of the receiving/blanking shaft; a roller shaft whichis provided with the roller shutter is enwound by protection curtains; the internal front wall of the casing is fixedly provided with a curtain bracket; a pressing curtain bar is arranged at the external side of the casing wall opening between the two curtain brackets; the locking block mechanism is arranged between the upper receiving/blanking shaft mechanism and the lower receiving/blanking shaft mechanism on the external wall of the casing; the transmission mechanism consists of a guideway shaft which is parallel to the longitudinal frame at one side of the casing, sliding blocks with fourcorners of the lower plate surface of the large seat plate respectively embedded on the guideway shaft, a motor which is arranged at the middle part of the lower plate surface, a large nut which is embedded on the guideway shaft and a gear mechanism which is sheathed on the large nut.