Abstract: An automatic cold/hot distilled water fountain which automatically performs water boiling, condensing, storing and heating processes to provide purified cold/hot drinking water, mainly composed of a distilling chamber, a condensing mechanism, a water reservoir and a heating box, whereby by the automatic control system designed for the water fountain, the water is controllably supplied into the distilling chamber and distilled therein and the distilled water is then collected and stored in the water reservoir to be directly discharged therefrom as a purified cold drinking water or further heated by the heating box to serve as hot drinking water. By the above arrangement, the amount of the water stored in the water fountain is properly kept within a predetermined range and what is most important is the safety and hygiene in water drinking is insured.