Packing machine box missing detection device

The utility model relates to the technical field of cigarette carton box missing detection, in particular to a packaging machine box missing detection device, which comprises a sliding rail, a box missing detection device, a box missing detection device and a box missing detection device, and is characterized in that the upper surface of the sliding rail is provided with front and back sliding chutes suitable for cigarette cartons to transversely pass through; the mounting plate is horizontally arranged and fixed right above the sliding groove; the proximity switches are vertically fixed on the mounting plate and extend below the mounting plate, the proximity switches are arranged in two rows and are distributed at intervals in the front-back direction, each row is provided with five proximity switches which are distributed at intervals in the left-right direction, and the two rows of proximity switches are distributed in a staggered mode in the front-back direction. The device is provided with the two rows o