The utility model discloses a photocatalytic air purifier with high adsorption performance ability, including having hollow structure's casing, still include to set up a filter net layer, excitation light source layer and the 2nd filter net layer on the casing from last under in order, the three is the connect -disconnect structure, respectively the plug install in the casing, a filter net layer and the 2nd filter net layer all include multiple hole metal mesh, diatomaceous earth coating and photocatalytic coating, the multiple hole metal mesh is as the carrier, is the thickness of diatomaceous earth coating 1 3mm, the coating is in the surface of multiple hole metal mesh, the photocatalytic coating coating is in in the diatomaceous earth coating, the excitation light source layer has a two -sided lamp belt structure, and the UVB lamp pearl that its top surface and bottom surface are 280~320nm by luminous wave band is with the zonation. The utility model discloses harmful gas moleculein can high -efficient adsorption of air, extension photocatalysis improves photocatalytic air purification efficiency to its processing time.