The subject innovation is in the bucket front of a conventional annular towel moisturizers, there is no base, the rear wall is formed with a hygrometer hook to place a hygrometer on top, attached to that put the transparent plastic of the size that a hygrometer, and also the hygrometer in put characterized in that based walking using holes place of the rear surface thereof to the hygrometer hook, and there hygrometer can be easily and conveniently observe the indoor humidity according fitted on the base body of the annular towel humidifier hygrometer of the bucket around by implication outside since a lot of water with air block and the advantage of measuring only the ambient humidity, to minimize the wet surface area of ​​the humidity in the room is too rises a lot (for example, 60RH%) towels or off the power of the blower can prevent humidity (過 濕) maintain a pleasant atmosphere and is effective to prevent the breeding of mites.