Provided is a purifying apparatus, which includes ultraviolet lamps and an ozone lamp having different wavelengths from one another and disposed in tubes to remove bacteria, VOC, bad odors in water or air, and these tubes are arranged in a serial or parallel way. Folds are formed at inner ends of the spiral photocatalytic sheets which are in contact with the lamps and the respective lamps are inserted into to increase the contact area with air or water and the one with the lamp, thereby preventing the lamp from being damaged. The purifying apparatus includes: an outer case having an inlet and an outlet； a spiral photocatalytic sheet to be inserted into the outer case； a UV lamp to be inserted into the spiral photocatalytic sheet, wherein folds are disposed at an inner side of the spiral photocatalytic sheet where a space for inserting the UV lamp is formed.
