NOVELTY - Preparation of catalytic electrode material involves mixing tantalum halide and urea, filling container with solvent, stirring at room temperature, adding tantalum halide to form homogeneous and stable mixture of urea solution, placing tantalum halide in oven in mixed solution of urea, drying, obtaining gel, placing obtained gel in a muffle furnace under inert atmosphere, sintering, adding solvent and triblock copolymer in the container, stirring until completely copolymer is dissolved, heating, performing heat treatment under inert atmosphere and furnace cooling.    USE - Preparation of catalytic electrode material (claimed).    ADVANTAGE - The catalytic electrode material is efficiently prepared with excellent catalytic activity, electrochemical stability and photovoltaic performance, and improved relaibility, by a simple method.    DETAILED DESCRIPTION - Preparation of catalytic electrode material involves mixing tantalum halide and urea, filling container with solvent, stirring at room temperature, adding tantalum halide to form a homogeneous and stable mixture of urea solution, placing tantalum halide in an oven in a mixed solution of urea at 80-100 degrees C, drying, obtaining gel, placing obtained gel in a muffle furnace under an inert atmosphere at speed of 1-4 L/minute, heating at rate of 120-200 degrees C/hour, sintering at 800-1100 degrees C for 3-5 hours, adding solvent and triblock copolymer in the container, stirring until completely copolymer is dissolved, adding phenolic compounds, tantalum and aldehyde, stirring until solution of homogeneous mixture is completely dissolved, stopping stirring, allowing the homogeneous mixture to stand for 3-14 days to solution stratification, removing supernatant solution, placing colloidal solution in the lower oven at 80-100 degrees C, drying for 3-14 days, forming porous gel, placing porous gel in a muffle furnace under an inert atmosphere at speed of 1-4 L/minute, heating at rate of 120-2000 degrees C/hour, sintering at 1000-1300 degrees C for 3-5 hours, obtaining tantalum-based composite electrode catalytic material, cleaning fluorine-doped titanium oxide conductive glass electrode catalyst film with isopropanol, washing with ethanol and deionized water, purifying by filtration and hot air drying in the drying chamber, mixing tantalum electrode catalyst material or matrix composite electrode catalyst material with milling media, adding to the dispersant, adding inorganic binder, processing distributed for 2-4 hours, obtaining electrode catalyst material slurry, processing with air gun electrode film on the electrode catalyst material slurry, spraying the cleaned surface of conductive glass electrode catalyst layer, spraying heat treatment of electrode film of electrode catalyst material with fluorine-doped tin oxide glass paste in a tubular furnace under an inert atmosphere at speed of 1-4 L/minute, heating at 400-500 degrees C for 15-30 minutes, performing heat treatment under an inert atmosphere and furnace cooling to room temperature.