Environment-friendly and energy-saving building outer wall decorative plate

The utility model discloses an environment-friendly energy-saving building outer wall decorative plate, which relates to the technical field of buildings, and comprises a plate body, the plate body comprises a protective layer, a buffer layer and a bottom layer, the bottom of the protective layer is fixedly connected with the top of the buffer layer, the bottom of the buffer layer is fixedly connected with the top of the bottom layer, and the bottom of the buffer layer is fixedly connected with the bottom layer. The protective layer comprises an anti-corrosion layer, a waterproof layer, a flame-retardant layer, a drying layer and a heat preservation layer, the bottom of the anti-corrosion layer is fixedly connected with the top of the waterproof layer, the reinforcing layer is in an X shape, the supporting layer, the reinforcing layer and the base plate form a plurality of triangles, and the reinforcing layer has the stability of the triangles; and meanwhile, through mutual cooperation of the first reinforcin