Method for making palladium film on surface of macro-porous carrier

A method for making a palladium film on the surface of a macro-porous carrier comprises the following steps: covering the surface of a porous carrier with an organic modification layer through an immersion coating technology, pre-coating the surface of a polyvinyl alcohol modification layer with a layer of palladium crystal seeds by using a sensitization-activation technology, making a palladium film on the surface of the organic modification layer through a chemical plating technology, and carrying out high-temperature thermal treatment under the protection of inert atmosphere to remove the organic modification layer in the palladium composite film in order to obtain the palladium film with good hydrogen permeability. The porous carrier is modified with an organic material, so the surface roughness of the carrier is effectively improved, and the surface aperture of the carrier is reduced; and simple thermal treatment is carried out after chemical plating of the palladium film to remove the organic modification layer, so resistance of the modification layer to hydrogen transfer is avoided. The method has the advantages of simplicity, agility, easy operation and strong practicality.