The invention discloses a micro direct methanol fuel cell membrane electrode assembly and a preparation methodtherefor. The membrane electrode assembly comprises an anode diffusion layer, an anode catalyst layer, a proton exchange membrane, a cathode catalyst layer and a cathode diffusion layer, wherein the anode catalyst layer is established by using PtRu/C or PtRu/black catalyst, Nafion and graphene aerogel; and the preparation method comprises preparation of the anode and cathode diffusion layers, preparation of the anode and cathode catalyst layers and the membrane electrode assembly formation through hot pressing. Compared with the conventional membrane electrode assemblies, the novel membrane electrode assembly provided by the invention, using the graphene aerogel with high conductivity, high porosity and high specific surface area to establish the catalyst layers, establishes the anode micro channel with excellent micro-structure performance without increasing the whole resistance of the membrane electrode assembly, increases the porosity of the anode catalyst layer and strengthens the mass transfer characteristic of the anode methanol fuel; and meanwhile, the novel membrane electrode assembly enables the anode gas reaction product to be discharged more easily, improves the whole output characteristic of the cell as well as increases the output power and improves the output efficiency.