The invention relates to a haze prevention air purifier which comprises a curtain mechanism, a PLC, a PM2.5 detector, a first air storage mechanism and a second air storage mechanism; the curtain mechanism comprises a connecting film, and a fixing plate, binding holes, a first magic tape, a second magic tape, a first ventilating pipe, a second ventilating pipe, air inflation pipes, air outlet pipes and air outlet holes that are arranged on and formed in the connecting film; the first air storage mechanism comprises a first electromagnetic valve, a second electromagnetic valve, a first air pump and an air storage tank; and the second air storage mechanism comprises a second air pump, housings, springs, a communicating pipe and air bags. The air quality is detected by the PM2.5 detector, air high in clean class is stored in the first air storage mechanism and the second air storage mechanism, and when haze is serious, the curtain mechanism is unfolded to shield a window and then the clean air in the first air storage mechanism and the clean air in the second air storage mechanism are released to the interior, so that haze air is prevented from entering the interior, and the quality of the air for people is guaranteed.