The utility model provides a trapezoid tobacco bale showing packaging box. The packaging box is formed by three triangular-prism-shaped tobacco bale boxes with the sections in an equilateral triangle shape in a series-connecting mode. The three triangular-prism-shaped tobacco bale boxes which are connected in series are parallel to each other, and the connecting faces are on the same plane. A tobacco bale cavity is arranged in each triangular-prism-shaped tobacco bale box. Cavity openings of the tobacco bale cavities are formed in the connecting faces of a box body. Box covers are arranged at the cavity openings. A tobacco bale showing groove is formed in the outer side of the box cover of each triangular-prism-shaped tobacco bale box. When the series-connected three triangular-prism-shaped tobacco bale boxes are in a closed state and a showing state, the box body is in a trapezoid shape. The trapezoid tobacco bale showing packaging box is simple in structure and convenient to use, great packaging effect can be achieved, the packaging box can be used as the showing box body for showing tobacco bales, and showing effect is good.