Abstract: Iron oxide with high purity was prepared by oxidation precipitation and calcination method.The Fe-Al precipitate formed in the purification process of acid leaching solution of serpentine was adopted as raw material.By some detailed investigation，such as the refined preparing of Fe-Al precipitate，the acid hydrolysis of iron-based precipitate，the reducing of Fe3+ in the acid hydrolysis solution，the purifying of iron solution，the preparation of iron oxide precursor（α-FeOOH） and the study of the calcination process，the optimum conditions were confirmed.Moreover，the corresponded experimental results indicated that the yield of iron and the purity of iron oxide could be up to 99.9% and 99.8%，respectively，which met with the quality requirements of ferrite iron applied in soft ferrite. 

Key words: serpentine, iron oxide, soft ferrite