The utility model discloses a corrugated box strikes seal device, including conveyer belt, driving roller and frame, the conveyer belt tensioning is on two driving rollers, and the both ends of driving roller are articulated to have fixed leg, and fixed leg fixes subaerial, is fixed with driving motor on one of them fixed leg, and driving motor is connected through the wherein one end of shaft coupling with the driving roller, and the frame is passed at the middle part of conveyer belt, the frame is door shaped frame, is fixed with a plurality of push cylinder of going up on the roof of frame, is fixed with a plurality of push cylinder down in the middle part backup pad of frame, and the middle part backup pad goes up push cylinder's push rod and fixes on the top board between two upper and lower conveying portions of conveyer belt, and lower push cylinder's push rod is fixed on the holding down plate. It is carried and strikes the seal automatically when corrugated box is folding yet, and it need not the manual work and strikes the seal, and is efficient, fast, reduces artifical intensity of labour greatly, has also reduced the cost of labor.