Preparation method of catalyst layer, catalyst layer and membrane electrode assembly

The invention relates to the technical field of catalyst layer preparation, in particular to a preparation method of a catalyst layer, the catalyst layer prepared by adopting the preparation method and a membrane electrode assembly comprising the catalyst layer. The preparation method comprises the following steps: preparing slurry, wherein the slurry comprises a catalyst, a binder, a dispersing solvent and a photocuring additive; coating a base material with the slurry to form a wet coating layer; irradiating the wet coating with ultraviolet light to cure the photocuring additive; and drying the wet coating to form the catalyst layer. The photocuring additive is added into the slurry, the wet coating is irradiated by ultraviolet light before being dried, the photocuring additive is cured under the irradiation of the ultraviolet light, a stable support structure is formed in the wet coating, the support structure can provide a stable benefit in the drying process, the defects such as layer collapse and cracks