Packaging box without adhesive tape

The utility model discloses a packaging box without adhesive tape, and relates to the field of packaging, two outer side paperboards at an upper sealing opening and a lower sealing opening of the packaging box are respectively provided with a gap block and a protruding part A corresponding to the gap block, the width of the gap block is 1-2 times of the thickness of the paperboards of the packaging box, and a semicircular protruding block is additionally arranged at the root of the protruding part A. The protruding block, the protruding part A and the gap block are controlled by the protruding block to achieve sealing of the packaging box. Protruding parts B are additionally arranged in the range where the gap blocks are located and around the gap blocks in some designs, the scheme that the protruding parts B and the protruding parts A are arranged on the outer side paperboards can be combined into multiple types, and the protruding blocks can be arranged in the length range of the gap blocks by twisting the