The present invention relates to a puffer for manufacturing grain snack, which allows to discharge uniformly cooked grain snack, and to cut at a desired length. The puffer for manufacturing grain snack comprises a screw having male screw groove having a spiral shape formed on the outer periphery, connected to be able to deliver the power to a grain transfer motor of the rear end in the state that keys are formed on both sides of the front end in the longitudinal direction to connect the mail screw groove for at least four pitches, rotating, and transferring and compressing the grains； a cylinder having a through-hole penetrated into the central area and inserted with a screw to be rotatable, a grain input entrance on one rear side of a body based on the transfer direction of grains to connect to the through-hole in perpendicular to the longitudinal direction, and a female screw groove having a spiral shape formed on the inner periphery of the through-hole, and pulverizing, transferring and compressing the grains input through the grain input entrance in the interval between the male screw groove of the screw and the female screw groove； a heater mounted on the outer periphery of the cylinder and delivering heat to the transferred grains； a grain snack discharge cap fixed to the front end of the cylinder, and having a grain guide plate having a tapered shape getting narrow in the inner diameter toward the outer direction in the inner central part, and a grain snack discharger formed from the central part of the grain guide plate to the outer direction； and a grain guide port having a grain guide protrusion of a cone shape in the center so as to contact to the grain guide plate of the grain snack discharge cap, and grain passing-through holes at the edge part at a constant interval.본 발명은 곡물스낵을 전체적으로 균일하게 익힌 상태로 배출해줄 수 있도록 함은 물론 원하는 길이로 커팅해줄 수 있도록 한 곡물스낵 제조용 퍼핑장치에 관한 것으로, 외주면에 나선형의 수스크류홈이 형성되고, 선단부의 양측에 적어도 4피치 이상 수스크류홈을 연결해주도록 길이방향으로 키가 형성된 상태로 후단부의 곡물이송모터에 동력전달 가능하게
