Composite greenhouse thermal insulation outer wall

The utility model relates to the technical field of greenhouses, in particular to a composite greenhouse heat preservation outer wall which comprises an inner-layer heat preservation film, a profile steel fixing framework, a rubber and plastic heat preservation plate and an outer-layer heat preservation film which are fixedly connected in sequence and parallel to one another. The bottom of the rubber and plastic heat preservation plate abuts against the water retaining brick wall and is fixedly connected with the profile steel fixing framework through bolts, and the bottom end of the inner-layer heat preservation film and the bottom end of the outer-layer heat preservation film both cover the outer portion of the water retaining brick wall in a lap joint mode. A horizontal heat preservation curtain is arranged in the greenhouse, a heat preservation sealing bag is arranged at the top end of the inner-layer heat preservation film, a certain included angle is formed between the heat preservation sealing bag and