NOVELTY - A fuel cell proton exchange membrane with reverse gas-permeable layer and humidification function, comprises layer of hydrogen (H2), oxygen (O2) reverse gas-permeable membrane or layer in the middle of a porous polymer proton exchange membrane; the reverse gas-permeable membrane or layer comprises porous proton exchange membrane base body, catalyst, or the proton exchange resin or an inorganic nano-particle filler.    USE - The fuel cell proton exchange membrane with reverse gas-permeable layer is used for humidification (claimed).    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is the preparation of the fuel cell proton exchange membrane with reverse gas-permeable layer and humidification function comprising: (1) diffusing the filling material in the solvent, diffusing adequately in vacuum, preparing the catalyst slurry, mass ratio of the catalyst and the solvent is 1:5-20; or diffusing the catalyst and an inorganic nano-particle in the solvent, steeping a porous proton exchange membrane in the catalyst slurry, diffusing adequately in vacuum, preparing the catalyst slurry, mass ratio of the catalyst, the inorganic nano-particle and the solvent is 1:1-10:100; adding a 1-20 wt.% proton exchange resin in slurry preparation process, the proton exchange resin is the same as the porous proton exchange resin membrane; where the solvent is water, alcohol or alcohol water solution, alcohol is methanol, ethanol, propanol, or isopropanol; mass ratio of water and alcohol in alcohol water solution is 1:1-100; (2) steeping the porous proton exchange membrane in the catalyst slurry, preparing the porous proton exchange membrane of the catalyst slurry, after taking out, drying at 70-100 degrees C in vacuum, repeating the process until load content of the catalyst attains demand content, boiling in 0.5 M sulfuric acid (H2SO4) solution for 1-2 hours, using de-ionized water for steeping, cleaning, drying in vacuum, obtaining the porous proton exchange membrane of the filling catalyst; (3)preparing the porous proton exchange membrane of the filling catalyst by heat pressing at 120-200 degrees C and 2-5 MPa for 0.5-2 minutes, obtaining reverse gas-permeable membrane or layer; (4) cutting prepared porous polymer proton exchange membrane and the reverse gas-permeable membrane or layer into the same size, lapping the porous polymer proton exchange membrane, the reverse gas-permeable membrane and the porous polymer proton exchange membrane in turn, two polyfluortetraethylene thin membranes with the same size are respectively put on the bottom and the top of the porous polymer proton exchange membrane, after heat pressing, obtaining a five-in-one laminated piece; and (5) carrying out heat pressing on the five-in-one laminated piece at 1-5 MPa and 120-200 degrees C for 1-5 minutes, taking out the laminated piece, peeling off the polyfluortetraethylene thin membrane on surface, and obtaining the proton exchange membrane.