The utility model discloses a carton tape -stripping mechanism, which comprises a frame, the upper portion of frame articulates has two driving rollers, and the conveyer belt tensioning is on two driving rollers, and one side of frame is fixed with driving motor, and the frame is stretched out to the one end of one of them driving roller, and driving motor's output shaft is connected through the one end of shaft coupling with this driving roller, the middle part top surface of frame is fixed with top support frame, the last air cylinder that is fixed with down of top support frame, the push rod of air cylinder passes top support frame downwards and fixes on the clamp plate of bottom down, the bottom clamp plate is in the top of conveyer belt, the both ends department of the bottom surface of bottom clamp plate is fixed with the joint support board, drive screw's both ends articulate on two joint support boards, the rear end of bottom clamp plate is fixed with drive machine, drive machine's output shaft is connected with the one end that drive screw stretches out the joint support board at rear through the shaft coupling, it can be automatically with tape -stripping on the packing box top, it need not manual work compaction again, the efficiency of its production is greatly improved.