The invention relates to a carton box overturning machine which is mainly applicable to equipment for overturning a carton box in which tobacco shreds or tobacco stems are stored and pouring to a downstream in the tobacco industry. The machine mainly comprises a rack, a carton box conveying device, an overturning body, a carton box fixing device, a carton box lifting device, a film bag locking device, a carton box vibrating slapping device, a leakage preventing device and an electric control system. According to the machine, the film bag locking device and the carton box vibrating slapping device are arranged, so that the problems that a plastic film falls off together with materials and is broken and deformed during pouring the materials from the carton box can be effectively solved, andmeanwhile, the problem that the materials in the carton box without the plastic film are adhered to the wall of the carton box can be solved, and as a result, the materials residual in the carton boxcan be greatly decreased; the leakage preventing device is arranged, so that the problem that materials fly during overturning the carton box can be solved, and meanwhile, the materials can be smoothly unloaded, and as a result, the materials, in particular the tobacco shreds, can be greatly prevented from breaking.