The utility model discloses a packing box made of cardboard. Parts of the corner or all the connecting angles of the packing box are formed by cutting and cutting the grooved paperboard inward along the cut groove, and the internal angle of the connecting angle is A substantially seamless, right-angled structure formed by the close contact of the two flute sides of the flute, the outer corners of the flanks being true right angles. The packaging box of the utility model can simultaneously have the advantages of high strength, low cost, elegant appearance and the like.
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