Composite phase change energy storage material and preparation method thereof

The invention discloses a composite phase change energy storage material and a preparation method thereof. The composite phase change energy storage material is obtained by compositing paraffin and hyperbranched polymer modified montmorillonite, wherein the hyperbranched polymer modified montmorillonite is obtained by firstly organically modifying inorganic montmorillonite by virtue of amino acid to obtain amino acid modified organic montmorillonite and then allowing the amino acid modified organic montmorillonite to react with an AB2 monomer. The hyperbranched polymer modified montmorillonite is composited with the paraffin, so that the energy storage density and energy storage effect of the obtained composite phase change energy storage material are remarkably improved; moreover, the preparation method is simple, the cost is low, the operation is easy, the mass production is realized, and the industrial application prospect is wide.