The invention relates to an adaptive bottle plug. The adaptive bottle plug is characterized in that a sealed spring ring which is formed with a circular spring steel wire and has a circular overall transverse section is arranged in a plug core, the outmost circle of the sealed spring ring makes contact with the inner surface of a rubber seal ring, the head end and the tail end of the sealed spring ring are provided with a head straight rod and a tail straight rod respectively, a connecting column connecting the upper end and the lower end in the plug core and having a fan-arc-shaped cross section is arranged at the center in the plug core. An inner rod and an outer rod are designed in the connecting column. The inner rod is arranged in the outer rod. A key capable of preventing the inner rod and the outer rod from relative rotating movement is arranged between the inner rod and the outer rod. The inner rod can move up and down relative to the outer rod. A positioning block is arranged at the outer circle of the lower end of the inner rod. A clamping groove capable of being matched with the positioning block and preventing the inner rod from rotating is formed in the lower end face of the plug core. A blind hole extending upwards with the lower end face as the start point is formed in the lower portion of the inner rod. A steel bead, a spring base and a reset spring are arranged in the blind hole. The adaptive bottle plug has the advantages of being good in sealing performance, good in adaptability and long in service life.