The utility model discloses a medical appliance, in particular discloses a sterilized cotton swab which comprises a cotton swab bar, a cotton ball, a cotton ball tank used for containing the cotton ball, and a cotton swab cover. The sterilized cotton swab is characterized in that the cotton swab bar has a hollow structure and is provided with a piston, the rear end of the piston is fixed with a button, the button is connected with the cotton swab through a track, and a hole is arranged on the front end face of the cotton swab bar. The cotton swab tank is inserted with the cotton swab bar, the bottom face of the cotton swab tank is provided with a hole corresponding to the hole on the front end face of the cotton swab bar, and the cotton swab cover is connected with the cotton swab tank by threads. The utility model has the advantages that the structure is simple, the use is convenient, the carrying for going out is convenient, the cotton ball can be changed, thimerosal in the cotton swab bar can not be polluted by only changing the cotton ball, the cotton swab bar can be utilized repeatedly, the wood is saved, and the environment is protected.