Container stopper capable of being rapidly opened and closed

A container stopper capable of being rapidly opened and closed, comprising a columnar plug body, an annular plug body and an elastic seal cartridge, wherein the columnar plug body comprises a plunger rod, the bottom of the plunger rod is provided with a base which can be inserted into the container or drawn out from the container, the shape and size of the above-mentioned base correspond to the shape and size of the straight section of the container or the smallest cross section of the container, an annular plug body is arranged above the base, a foldable and deformable elastic seal cartridge is arranged between the annular plug body and the base, the annular plug body and the base can both move mutually along the axial direction of the container in the container under an external force to press the elastic seal cartridge, such that the elastic seal cartridge is radially expanded outwardly to form a seal ring between the inner wall of the container and the outer contour of the base, the outer contour size of the seal ring is larger than the inner surface size of the straight section of the container or the inner surface size of the container at the minimum cross section, and the seal ring and the base together form a sealing layer which realizes the rapid closing of the container.