The invention provides a micro-nano structure electrode material for a super capacitor and a preparation method of an electrode plate. The electrode material comprises a matrix and an amorphous alloy material, wherein the matrix is formed by a current collector; the matrix is plated with the amorphous alloy material; the amorphous alloy material is one of an amorphous nickel-copper-phosphorus alloy, an amorphous nickel-cobalt-phosphorus alloy or an amorphous nickel-iron-phosphorus alloy; and amorphous nickel-copper-phosphorus alloy nanoparticles are evenly distributed on the surface of a micron-size cellular amorphous nickel-copper-phosphorus alloy. The preparation method of the electrode plate comprises the following steps: alkaline degreasing, washing, pickling, washing, chemical plating, washing, corroding, washing, airing or blowing. The prepared amorphous nickel-copper-phosphorus alloy electrode plate has the advantages of good conductivity, mechanical property, corrosion resistance and heat resistance, small internal resistance, high specific capacitance, good cycling stability, high adhesion between the electrode material and the current collector, uniform thickness of the electrode material and the like; the preparation method provided by the invention has the characteristics of low required equipment investment, few procedures, simplicity in technological operation, good repeatability and the like, and is easy to control, and applicable to industrial production.