A UV curing apparatus includes a processing chamber, a UV light source disposed above the processing chamber, a window disposed between the processing chamber and the UV light source for allowing a UV light from the UV light source passing through and entering the processing chamber, a sealing ring disposed between the processing chamber and the window for sealing the processing chamber, and a light shading kit disposed between the UV light source and the sealing ring for preventing the sealing ring from being exposed of the UV light. Therefore the sealing ring is not exposed of UV light directly, and the bonding of the rubber sealing ring would not be destroyed.