The invention discloses a large-panel back-laminated mold, comprising a first mold and a second mold; a first pouring cavity is arranged in the first mold, a first heat-resistant rubber belt is fitted in the first mold and is positioned on the side of the first pouring cavity, and fifth positioning pins and fourth ejector pins are mounted in the first pouring cavity. The first heat-resistant rubber belt and a second heat-resistant rubber belt can be fastened during mutual mating of the first mold and the second mold, a second pouring cavity and the first pouring cavity are tighter, and material leakage in pouring is avoided.