Preparation method of membrane electrode assembly, membrane electrode assembly and fuel cell

The invention provides a preparation method of a membrane electrode assembly, the membrane electrode assembly and a fuel cell. The membrane electrode assembly comprises a proton exchange membrane containing a solid polymer electrolyte; an anode catalyst layer formed on the first surface of the proton exchange membrane; the cathode catalyst layer is formed on the second surface of the proton exchange membrane; the anode catalyst layer and the cathode catalyst layer are both of a multi-layer gradient structure. The method has the beneficial effects that the gradient multi-layer membrane electrode assembly can be rapidly prepared, the problem of low working efficiency in the gradient multi-layer membrane electrode preparation process is solved, and the preparation efficiency of the gradient multi-layer membrane electrode assembly is improved; and meanwhile, by utilizing the mutual solubility characteristic of the high polymer material at high temperature, the mass transfer capacity among the multiple catalyst la