Composite hydrogen filtering film with middle diffusion layer made of amorphous nickel-tungsten alloy

The utility model relates to a composite hydrogen filtering membrane with an intermediate diffusion layer made of amorphous nickel-tungsten alloy. The composite hydrogen filtering membrane consists of a porous aluminum oxide ceramic support body, a pure palladium layer A, an amorphous nickel-tungsten layer and a pure palladium layer B, wherein the porous aluminum oxide ceramic support body can be tubular porous aluminum oxide ceramic or sheet-shaped aluminum oxide ceramic. The pure palladium layer A is plated on the surface of the supporting body through chemical plating, then the amorphous nickel-tungsten layer is prepared through electroplating, and finally the pure palladium layer B is plated on the surface through chemical plating. The pure palladium layer provides dissociation and desorption for hydrogen, the amorphous nickel tungsten layer provides good strength and ductility to guarantee long-time stable work of the composite membrane on one hand, and on the other hand, a part of palladium material is