The invention discloses an air purifier. The air purifier comprises a purifier main body which comprises a shell, a water storage tank, an air outlet box and an air inlet box, wherein the water storage tank is arranged at the bottom of the shell, the air inlet box is located on the front side of the top end of the water storage tank, the air outlet box is located on the upper rear side of the water storage tank, a baffle is arranged at the front end of the machine shell, an air inlet is formed in the upper end of the water storage tank, a polypropylene air-liquid exchange filter element attached to the inner side edge of the air inlet is arranged at the inner side edge of the air inlet, a plurality of water hoppers are uniformly arranged on the circumference of the polypropylene air-liquidexchange filter element, a motor is arranged on the inner side of the polypropylene air-liquid exchange filter element and located in the air inlet box, an air outlet is formed in the top end of theair outlet box, and a fan matched with the air outlet is arranged at the bottom of the air outlet. By adding purified water to purify the air, harmful gases in the air are effectively removed, and thehealth level of people is increased.