The invention provides a preparation method of a nickel cobalt oxide/nickel tungsten oxide/polyaniline three-element composite nanowire array electrode. The preparation method comprises following steps of step 1, preparaing a nickel cobalt oxide nanowire array; step 2, preparing a nickel cobalt oxide/nickel tungsten oxide nuclear shell nanowire array; step 3, preparing the nickel cobalt oxide/nickel tungsten oxide/polyaniline three-element composite nanowire array electrode. According to the invention, by adopting the hydrothermal synthesis technology, and taking the foaming nickel with the good conductivity and a special loosened and multi-hole structure as a substrate, the nickel cobalt oxide/nickel tungsten oxide nuclear shell nanowire array is prepared through two hydrothermal steps, so a tedious electrode sheet preparation process is avoided, use rate of active materials can be effectively improved, the active surface is enlarged and diffusion and mass transfer performance of the material is improved. A by deposing the polyaniline on the surface of the nickel cobalt oxide/nickel tungsten oxide nuclear shell nanowire array through a simple chemical polymerization method, the nickel cobalt oxide/nickel tungsten oxide/polyaniline three-element composite nanowire array electrode can be obtained.