Hand-held packaging box capable of being flattened and automatically formed

The utility model provides a hand-held packaging box capable of being automatically formed after being flattened. The hand-held packaging box comprises a first paper folding plate and two second paper folding plates oppositely arranged on the first paper folding plate, and the first paper folding plate is divided into a bottom plate, a side plate, a cover plate and a clamping plate through a first folding mark a, a first folding mark b and a first folding mark c; the two second paper folding plates are each provided with two second folding marks a, the two second folding marks a coincide with the two first folding marks a, and the second paper folding plates are further symmetrically provided with two clamping grooves used for being matched with the clamping plates. The packaging box is of an integrated structure, the packaging box can be flattened during transportation, and therefore transportation space and cost are saved; the second paper folding plate is pasted on the first paper folding plate to serve as