Provided are a tape-type fluorine preparation using a biodegradable polymer and a method of preparing the same, and preferably, a tape-type fluorine preparation which is attached to teeth to gradually release fluorine, thereby maintaining a suitable fluorine concentration in an oral cavity, and self-degraded after a certain amount of time, and a method of preparing the same. The tape-type fluorine preparation includes a pressure-sensitive adhesive sheet containing fluorine and capable of being attached to teeth, and the pressure-sensitive adhesive sheet is formed of a biodegradable hydrophilic polymer in an oral cavity to reduce a rate at which the fluorine is released.