The invention discloses a proton exchange membrane fuel cell membrane electrode and its preparation method, constitutes by three layers, the intermediate layer is proton exchange membrane,two side respectively is porous negative pole catalysis diffusion layer and porous anode catalysis diffusion layer. The porous negativepole catalysis diffusion layer and the porous anode catalysis diffusion layer is composed by the catalyst, the cementing agent and the carbonfiber, its outside surface is composed by the carbon fiber which mutually interweaves by 0-180 degree. The invention structure membrane electrode uses the static electricity flocking technology, directly implants the carbon fiber to the proton exchange membrane of the spread brush catalyst and the cementing agent, then makdes the traditional membrane electrode catalyzed layer and the diffusion layer into a unification, thus simplified the membrane electrode preparation craft, enhanced the membrane electrode catalysis layer and the diffusion layer combining capacity, improved the membrane electrode electro chemistry performance, under the current density is 300mA/cm2 condition, the battery electric discharge power increases 13-22%.