The utility model relates to an air sterilization deodorizer which comprises a box body, an undercritical frequency conversion photooxidation reactor, a biologic sterilizing liquid electrothermal evaporator and an electric fan, wherein the frequency conversion photooxidation reactor and the biologic sterilizing liquid electrothermal evaporator are arranged in the box body. The box body is provided with an air inlet and a vent hole, wherein the air inlet is provided with an electric fan. The utility model has the advantages that the utility model oxidizes and decomposes odoriferous and stale materials by superoxide anion and OH hydroxyl free radical in an aerosol glue ball and an undercritical ionic field in the biologic sterilizing liquid. Viruses and relative pathogenic genes floating in the air are killed and the intrusion, the diffusion and the propagation of the viruses and the relative pathogenic genes floating in the air are suppressed, so that the indoor air quality is enhanced and the indoor air is innoxious, odorless, safe and comfortable. Because of double action of oxidation and decomposition, the effect of exterminating various harmful gases is greatly enhanced. Two time relays can respectively set the time length of two purifying modes as required so as to reduce unnecessary energy resource waste and obtain efficient purifying effects.