Recently,the research focus and cutting-edge field of spintronics is to design spin valves by molecular materials and make them implement a specific function. However, for molecular spin valves, experimental and theoretical studies mainly focus on a ferromagnetic metal/molecule/ferromagnetic metal sandwich structure model which has many disadvantages. Therefore, in this project, we construct supramolecular spin valves based on single-molecule magnets and graphene nanoribbons, which acts as an improvement program for the limitations of the ferr...