The utility model discloses a smoke box bottom joint sealing sticky tape cutting device, this cutting device installs in the rollgang department of getting the case robot upper reaches, cutting device connects the curb plate including two of being located the left and right sides, it installs respectively on two side guard plates of the rollgang left and right sides to connect the curb plate for two, it is connected with cylinder stationary support seat to connect can dismantle between the curb plate for two, guide rod cylinder is taken to cylinder stationary support seat mid -mounting, take guide rod cylinder's the vertical upwards extension of flexible end, take guide rod cylinder's flexible serving to install cutter blade fixing seat, cutter blade fixing seat is last to be provided with the blade through two splint centre grippings, the rising and the decline of the flexible realization blade of the flexible end through taking guide rod cylinder. The utility model discloses the advantage: can open smoke box bottom joint sealing sticky tape automatic cutout before getting the action of case robot, fundamentally has solved the problem that smoke box bottom joint sealing sticky tape can't be severed, has avoided the production cutout, has promoted work efficiency.