Abstract: As a new type of porous crystalline organic framework material, magnetic covalent organic frameworks (MCOFs) combine the advantages of magnetic nanoparticles and covalent organic frameworks (COFs), exhibiting large specific surface area, good thermal and chemical stability, and high saturation magnetization. MCOFs can quickly separate pollutants from solutions and make up for the shortcomings of the COFs, which is difficult to separate and recover. Therefore, they haves great potential applications in magnetic solid phase extraction, biological detection, sensing and so on. However, there are few reports on the preparation methods of MCOFs. The preparation methods are different according to different connection forms of magnetic nanoparticles and COFs. According to the relevant literature form 2011 to 2019, the preparation methods of MCOFs are reviewed in this paper, including coating method, monomer polymerization method and in-situ synthesis method. At the same time, this paper discusses the development direction and potential applications of MCOFs, hoping to provide theoretical basis for the research of MCOFs. The coating method requires mild preparation conditions and preserves the integrity of magnetic nanoparticles, which is the most widely used method. The monomer polymerization method is simple to operate, but the preparation conditions are harsh and not easy to control. The in-situ synthesis method for the preparation of MCOFs is more dependent on the covalent triazine skeleton prepared by the monomer polymerization method, and the preparation conditions of MCOFs based on other types of COFs need to be continuously developed. Furthermore, the preparation method of the magnetic covalent organic frameworks should be considered from the aspects of material design diversity and wide application, which is expected to develop in large-scale industrial applications.