The present invention relates to a sterilizing tap and a water-purifying device using the sterilizing tap. The sterilizing tap includes a tap body having a waterway connector connected to a waterway formed at its side, a screw hole formed at its top, and an outlet formed at its bottom; and a sterilizing unit, wherein the sterilizing unit includes a bolt unit coupled to the screw hole, an ultraviolet ray generator disposed within the tap body when the bolt unit is coupled to the screw hole, for generating ultraviolet rays, and a first quartz tube sealed to the bolt unit to completely surround the ultraviolet ray generator. The water-purifying device includes a first room formed at one side of the water-purifying device body land having a waterway through spring water is supplied from the water tank; a sterilizing tap communicated with the waterway, for sterilizing spring water and discharging the sterilized spring water; a second room formed at the other side of the water-purifying device body, wherein cups are provided in the second room; and doors installed in the first room and/or the second room, for preventing the sterilizing tap and/or the cups from being.