The utility model directs to a foldaway packing carton specifically for pens and ball-pens. The carton body (1) consists essentially of a complete piece of material, in the middle of which there's a crease. The material is divided into two pieces: front piece and back piece (11, 12), with their shapes matching with each other. Side wall creases (13) are available to the pieces (11, 12), which are close to the edges. The side walls (14) of the pieces (11, 12) are folded and surrounds into the cavity for the packing carton. Compared with prior art, the utility model adopt foldaway process. It can be made of a complete piece of PVC material, which is of high strength and hard to get damaged. Self-adhesive sticker is used to bind the openings between the pieces (11, 12), which can be re-used a plurality of times for this reason.