▎ 摘　　要

NOVELTY - The device has a shell arranged with a centrifugal device and a photo-catalyzing device and fixed with an air inlet and an air outlet. The centrifugal device is arranged on a top part of the photo-catalyzing device. A light source i.e. UV light LED lamp is arranged in a photo-catalytic film. A three-dimensional graphene layer is arranged between a substrate layer i.e. nickel net and a nano-silver layer i.e. TiO2 nanometer film layer. The photo-catalytic film is installed on a stereoscopic screen. An activated carbon sponge is covered on a three-dimensional mesh plate. USE - Air sterilizing and purifying device. ADVANTAGE - The device can purify harmful gas such as formaldehyde gas in an air and kill harmful bacteria in the air. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a photo-catalytic film preparation method. DESCRIPTION OF DRAWING(S) - The drawing shows a front view of an air sterilizing and purifying device.