The invention discloses an improved structure of a sealed packaging container, comprising a container cover and an open container body. Edges of the container cover are provided with a first inner mating groove and a first outer mating groove of a rotary structure. An opening of the container body is correspondingly provided with a second inner mating groove and a second outer mating groove of therotary structure. The second inner mating groove is nested in the first inner mating groove, and the first outer mating groove is nested in the second outer mating groove. An anti-tripping structureis further arranged. At least one pair of corresponding groove walls of the first inner mating groove and the second inner mating groove or the first outer mating groove and the second outer mating groove are in a tapered shape matched with each other and are attached to each other. An outer groove wall of the second outer mating groove extends downwards from an upper end part to form two indentations which are easy to tear. A security tear-off stripe is formed in a portion between the two indentations. The depth of the two indentations is slightly smaller than the wall thickness of the outergroove wall of the second outer mating groove. The packaging container disclosed by the invention is high in deformation resistance, stable in anti-tripping structure, and good in sealing performance.