The work aims to design a composite portable paper gift box with regular hexagon to promote the sale of special agricultural products. The traditional bamboo-wood hexagonal food box structure was used as the design prototype. The "T-X-T" three-dimensional modeling method was used for the box structure design. The handle design and sticking locking structure were used to improve the portability of the gift box. The mechanical properties of the box structure were simulated and analyzed by Solidworks software. An accurate edge relational structure map could be obtained by decomposing the main box structure with the "T-X-T" model. The compressive strength of the box could be improved by increasing the adhesive area in the process of pasting side plate into box. In the case of the same paper consumption, the angle of the side board angle had an important influence on the outer size of the box. When the design range of the side plate angle was between 60° and 90°, the formula of the outer size after the three-dimensional modeling was obtained. The final design of the portable gift box is elegant and beautiful. Meanwhile, the handle design is portable and foldable. The reverse insertion lock hole design can improve the locking ability of the lid. When the side plate is pasted into a box, the compressive strength and stacking performance of the box could be improved.