A water supplement member for atomizers is revealed. A vibrator corresponding to a movable water delivery device is mounted in a seat so as to convert water to a mist. A water tank is used to supply the water delivery device water. A slot hole is disposed on the water tank for a transparent water supplement container inserted through the seat to be mounted with. Thus water supplement for producing a mist is achieved. Thereby the shelf life of the atomizer is extended. Moreover, the water level can be seen clearly though the transparent design of the water supplement container. Once the water level is lowered, the water is filled. Thus both the vibrator and the water delivery device have longer life time.