The invention relates to a purely folding gift packing box. The purely folding gift packing box consists of a box cover and a box body, wherein the box cover is formed by folding a press-forming single box cover paperboard sheet; the box body is formed by folding a press-forming single box body paperboard sheet; and an auxiliary support frame and a gift storage cavity are arranged in the box body. The box can be formed only by vertically folding the paperboard sheet along line-shaped press marks on the paperboard sheet. The purely folding gift packing box has the characteristics of single material, bonding saving, simple structure, smooth appearance, convenient manufacturing, time saving and the like. The box can be directly manufactured and formed by bending along the line-shaped press marks on the paperboard sheet in site. Conventional packaging can be performed after a gift is placed in the gift storage cavity and is covered by the box cover which is folded instantly in site, so that problems that a gift packing box has a complicated structure and consumes a great number of materials, the manufacturing process is complicated and time consuming, the box must be processed and shaped in advance and requires large-area warehouse configuration, empty boxes are transported by vehicles and are easily damaged, and the like in the prior art are solved, and the purely folding gift packing box has high practicability and wide market application prospect.