Car air purifier 1íóthe technology of air pollution intelligence monitoring; automatically monitor nocuous gases such as fog, alcohol, benzene and carbon monoxide etc through its high sensitive sensor, keeping quickly reacting and stable and record the quality of air at any time. 2íóthe technology of nanometer photo-catalysis optical fusion: decompounded all nocuous gases such as the smells, smoke, benzene, formaldehyde, carbon monoxide and carbon dioxide through the technology of nanometer photo-catalysis optical fusion. 3íóthe technologies of positive, negative ions purifying and oxygen added; there are a group of positive and negative ions released continuously into the air by the generator for sterilization and disinfection intensely, while lots of its negative ions could improve the quality of the air in the sealed room.