The invention relates to the technical field of packaging containers of products, and provides a container sealing device which comprises a container sealing device body formed by assembling an inner cover and a control cover, the inner cover is provided with a cover surrounding structure and a
barrel surrounding structure which are of an annular
barrel-shaped structure and connected together, the cover surrounding structure is provided with a first buckle, and a sealing piece is arranged at the head end of the
barrel surrounding structure; a concave chamber structure and a supporting and pressing structure are arranged on the inner wall of the sealing piece; the
tail end of the control cover is closed or is provided with a channel structure, the inner wall of the side wall of the control cover is provided with a second buckle, the inner wall of the
tail end of the control cover is provided with a cavity cylinder or an arc-sheet-shaped structure, and the cavity cylinder or the arc-sheet-shaped structure is provided with a sharp structure and a rib sheet; the sharp structure is located in the concave chamber structure of the barrel surrounding structure, and the sharp structure can slide,
cut, support and press from the concave chamber structure of the inner cover to open the sealing piece, so that materials in the container sealing device are released. In addition, the invention further provides a component of the container sealing device, a packaging container and application.