This paper describes a small—scale air purifier.It is composed of air filteration unit;bactericidal x-ray unit,drug releasing unit and air feeding unit ect.Powered byvehical battery cell,it produces clean and fragrant air after the process of dast removing,smoke -filtering,bactericide and deodorising.It can give out clean air 200m~3/h,it fit for the air purifying in the vehical、hospital and family living room.