Light catalytic air purifier

The utility model discloses a photocatalytic air purifier, which comprises a casing, an air passage provided with at least one air inlet and at least one air outlet, a power source and a controller, wherein a fan, a filtering device, an ultraviolet light source and a photocatalyst filtering layer are arranged in the air passage; the filtering device orderly comprises at least one coarse filtering layer and one HEPA filtering layer along the air flow direction. The utility model is characterized in that the ultraviolet light source is composed of a plurality of ultraviolet light emitting diodes which are distributed on a mounting surface; the photocatalyst filtering layer and the mounting surface are arranged in parallel. The utility model can solve the problem of short service life, small irradiation rang and nonuniform irradiation of ultraviolet lamp tubes, can the manufacture high-efficient and economical photocatalytic air purifier with long service life, and is favorable for popularization and application of photocatalytic technology in the aspect of air purifying device.