Pressure-resistant container sealing method

The invention belongs to the technical field of oil and gas geological experiments, and relates to a pressure self-sealing method, in particular to a pressure-resistant container sealing method. The pressure-resistant container sealing method involves a container and a plug, wherein a sealing device is arranged on the plug, and the space between the container and the plug is sealed through the sealing device; and the method is characterized in that the sealing device comprises a shell (1) and a metal sheet framework (2) in the shell (1), the opening direction of the sealing device faces an experimental medium, the plug is tightly screwed to a barrel body, and the sealing device at the front end of the plug is fed into the smooth barrel body; and when the experimental medium in the container is pressed, the experimental medium in the container flows into the sealing device firstly, the generated pressure enables the two side walls of the metal sheet framework to be gradually expanded, the outer side wall of th