Abstract: The present invention relates to a device for supplying cold and hot water having a sterilization function by using UV light, and more specifically, to a device for supplying sterilized cold and hot water which includes a UV sterilization lamp and a see-through window for easily checking the contamination state of the inside of a water tank with the naked eye. The device for supplying sterilized cold and hot water according to one embodiment of the present invention is characterized in that the entire top surface or the entire side surface of the water tank is formed as a see-through window such that the internal state thereof can be checked from the outside.