目的 综述了纳米 Fe3O4磁性粒子的制备方法和机理， 找出纤维素磁性纳米复合膜的基本复合方法。 方法 比较分析沉淀法、水热反应法、微乳液法、溶胶凝胶法、高温分解法等制备纳米Fe3O4磁性粒子的优缺点。 结果 总结了纤维素磁性纳米复合膜研究和应用进展， 并为今后纤维素磁性纳米复合膜的发展提出了建议和新思路。 结论 采用原位复合的方法制备纤维素磁性纳米复合膜是目前的研究热点，具有显著的意义和广阔的发展前景。

Objective In order to find the basic complex method of the magnetic cellulose nanocomposite films, the preparation methods and mechanisms of nano-Fe3O4 were reviewed in this paper. Methods The advantages and disadvantages of a series of preparation approaches including precipitation method, hydrothermal reaction method, microemulsion method, sol-gel method, pyrolysis method were analyzed. Results The researches and applications of magnetic nanocellulose films were summarized. And some suggestions were given for future development of the magnetic cellulose nanocomposite films. Conclusion In-situ composite preparation of magnetic nanocellulose films is a hot spot in research and has significant meaning and bright prospects.