Abstract: Photocatalytic technology is an efficient method of utilizing light energy,which generates highenergy active species on the surface by exciting the catalyst,thereby triggering surface chemical reactions and converting light energy into chemical energy or accelerating the speed of chemical reactions. In recent years,photocatalytic technology has been extensively studied in the fields of environmental purification,energy convertion,and resource recovery. This paper reviews the development and application of photocatalytic technology in recent years and discusses the future challenges and prospects it faces. In terms of environmental purification,photocatalytic technology is used for the degradation of organic pollutants,the removal of atmospheric pollutants,and greenhouse gases;in the field of energy convertion,it is applied to solar energy conversion,hydrogen production by water splitting,and the reduction of CO₂ into multi-carbon,high-value fuels;in the field of resource recovery,photocatalytic technology can effectively recover precious metals from waste electronic scrap.