The invention provides preparation of an organic modified hydrotalcite and application of the organic modified hydrotalcite to a solar battery back panel. The solar battery back panel is excellent in hydrothermal aging resistance, fire resistance and barrier performance. The solar battery back panel is composed of a weather-resisting layer, an insulating layer and a fluorine-containing bonding coating, wherein the fluorine-containing bonding coating is formed by coating a fluorine-containing paint, which is prepared from fluorocarbon resin, the organic modified hydrotalcite, polyurethane acrylate (PUA) and isocyanate. By means of the modified hydrotalcite applied in the fluorine-containing bonding coating, the solar battery back panel is good in EVA (ethylene-vinyl acetate copolymer) initial bonding performance and hydrothermal-aged bonding performance and obtains excellent fire resistance, weather resistance and water vapor barrier property.