Used graphene oxide and adamantane as raw materials, the amantadine functionalized graphene oxide composites (A/GO) were prepared through an aqueous phase synthesis method, and their structures were characterized by FT-IR, XRD and XPS. Compared with graphene oxide, A/GO has more efficient adsorption performance for methyl blue (AB93). The adsorption kinetics and adsorption isotherm model of A/GO adsorption of AB93 accord with pseudo second-order kinetics and Langmuir model. Theoretical maximum adsorption capacity of A/GO (qm) can achieve 1250.0 mg/g. Thermodynamic analysis shows that the adsorption of AB93 by A/GO is a spontaneous exothermic process. A/GO adsorbed AB93 showed good resistance to salts (NaCl and KCl), while CaCl2 could effectively promote A/GO adsorbed AB93. In addition, A/GO can also efficiently and selectively adsorb AB93 from the mixed dyes of congo red and AB93.