A bubble atomizer includes a cartridge having an open end, a liquid absorbing member provided inside the cartridge, a firing chamber covering the open end and formed with liquid outlets and liquid inlets through which liquid enters the firing chamber from the cartridge, and heaters mounted inside the firing chamber. The heaters are connected with a power electronics unit through a cable. Each heater has a thickness in micron to sub-micron scale. When a pulse signal generated is applied to the heaters, current generated heats up the heaters and vapor bubbles are formed on the heaters that generate pressure and push the liquid out of the firing chamber through the liquid outlets to thereby form droplets.