An air purification device composed of a photocatalyst filter includes an outer shell with an accommodation space inside, and an air inlet hole is provided on two sides of the front end of the outer shell, and at least one air outlet hole is provided on the two sides of the rear end； Activated carbon filter is located in the accommodating space adjacent to the air hole. It contains activated carbon components, which can effectively filter fine molecules containing PM2.5 particles. A fan is installed on the back side of the activated carbon filter. A photocatalyst The filter screen is composed of a metal mesh composed of embedded TiO2 nano-particles, which is arranged behind the fan and allows the air drawn from the fan through the air holes to pass through the photocatalyst filter； and an LED UV photocatalyst lamp set is arranged in the container. In the space, it contains several LED grains that can produce UV light sources, which are used to generate light sources with a UV wavelength in the range of 250 to 400 nm. The light source of the LED UV photocatalyst lamp group is irradiated with a photocatalyst filter to generate free radical molecules. The toxic gas molecules are automatically decomposed to purify the air； thereby, a photocatalyst air purification device with filtering fine particles and automatically decomposing harmful substances in the organism is combined.一種光觸媒濾網所組成的空氣淨化裝置，包含一外殼體，其內部具有一容置空間，且外殼體前端二側設有一進風孔，其後端二側至少設有一個出風孔；一活性碳濾網，設在臨進風孔之容置空間內，其內含活性炭成分，可有效過濾含PM2.5顆粒的微細分子；一風扇，設在活性碳濾網的後側；一光觸媒濾網，由含有嵌鍍TiO2奈米顆粒組成的金屬網所構成，其設置風扇後方，且令風扇自風孔抽入之空氣通過光觸媒濾網；以及一LED UV光觸媒燈組，設置於容置空間內，其包含數個可產UV光源的LED晶粒，用以產生UV波長介於250～400nm範圍的光源，且令LED UV光觸媒燈組的光源照射光觸媒濾網，可產生自由基分子來自動分解有毒氣體分子，用以淨化空氣；藉此，組合成一具有過濾微細顆粒和自動分解有機體有害物質的光觸媒空氣淨化裝置。
