Abstract: The existing classification equipment craft is limited mostly because of microfine weakly magnetic iron minerals (<20μm). The tiny iron ore is unable to recycle effectively, bring about a large of useful minerals running off, therefore people begin to explore the new craft under now available condition. In many new processing crafts, the selectivity flocculation technology has a stronger vitality. Both theory and practice have developed quickly. In this paper the principle and the method of microfine weakly magnetic iron mineral selectivity flocculation are introduced and the current status of the application are reviewed, then analyzed the development trends in the future.