The invention relates to the technical field of air purification, in particular to an air purifier, which comprises an air passage, wherein a fan is arranged in the air passage, the interior of the air passage is sequentially provided with a filtering net, an ionizing and polarizing assembly, an electromagnetic deflection assembly, an adsorbing assembly and an ultraviolet light disinfection assembly along the air flow direction, the filtering net sequentially comprises a metal filtering net layer and a fiber filtering net layer along the air flow direction, the ionizing and polarizing assembly comprises an ionizing pole plate on the axis of the air passage, the ionizing pole plate is provided with a plurality of barbed poles, the electromagnetic deflection assembly comprises an excitation deflection coil, the adsorbing assembly comprises the grounded air passage body or an adsorbing layer, the adsorbing layer is grounded and is attached to the inner wall of the air passage, and the ultraviolet light assembly comprises a plurality of ultraviolet light pipes. The air purifier has the advantages that the direct passing, jumping and escape of particles in the air are limited, the adsorbing effect is improved, and the purifying efficiency is improved; the air purifier is favorable for the gaseous particles with maximum particle size smaller than or equal to 10 micrometers, namely PM10, and is especially suitable for the particles with maximum particle size smaller than or equal to 2.5 micrometers, namely PM2.5.