Internal-external combined building external wall composite insulation structure

The utility model discloses an inside and outside combined building outer wall composite heat preservation structure, which relates to the field of building outer wall heat preservation and comprisesan outer wall body and a heat preservation plate positioned on the outer side of the outer wall body, and the heat preservation plate sequentially comprises a decorative protection layer, a heat preservation layer and a base layer from top to bottom; the heat preservation layer comprises an extruded sheet layer and an inert gas layer, and the extruded sheet layer and the calcium carbonate sheet layer are bonded through acrylate glue. And the base layer is nailed and adhered to the outer wall body. By arranging the insulation board decorative board on the outer side of the outer wall, the outerwall can be decorated and insulated at the same time; the heat preservation effect of the outer wall is enhanced by adopting the double heat preservation layers of the extruded sheet layer and the inert gas layer; the double