The invention discloses a functional graphene oxide/hyper-branched polyarylether proton exchange membrane and a preparation method thereof. The method comprises the following steps: preparing functional graphene oxide; and doping the prepared hyper-branched polyarylether with the functional graphene oxide, thereby obtaining the functional graphene oxide/hyper-branched polyarylether proton exchange membrane. According to the method disclosed by the invention, the functional graphene oxide serving as an inorganic nano-filler is added into the hyper-branched polyarylether, so that the proton conductivity and water holding capacity can be improved, the inter-chain winding action can be increased, and the mechanical property is further improved. Meanwhile, the dispersity of inorganic particles is improved, and the compatibility is enhanced. Moreover, the functional graphene oxide has excellent chemical resistance, so the oxidation stability of the proton exchange membrane can be effectively improved. In addition, the method is convenient to operate and easy to realize.