The invention discloses an improved structure of a sealing packaging container. The improved structure comprises a container cover and a container body with an opening, the side edge of the containercover is provided a first inner matching groove and a second outer matching groove which are of rotary structures, and the opening edge of the container body is correspondingly provided with a secondinner matching groove and a second outer matching groove which are of rotary structures; the second inner matching groove is embedded into the first inner matching groove, and the first outer matchinggroove is embedded into the second outer matching groove; and an anti-releasing structure is further arranged. At least one pair of corresponding groove walls of the first inner matching groove and the second inner matching groove are in matched taper shapes and are attached together. The inner groove wall of the first inner matching groove and the inner groove wall of the second inner matching wall are in linear contact in an elastic abutting-against manner or the outer groove wall of the first inner matching groove and the outer groove wall of the second inner matching groove are in linearcontact in an elastic abutting-against manner. The outer groove wall of the first outer matching groove and the outer groove wall of the second outer matching groove are in linear contact in an elastic abutting-against manner. The packaging container has the high anti-deformation capacity, the anti-releasing structure is relatively stable, and the sealing performance is better.