The invention discloses a reinforced concrete slab-plate truss mixed arch structure. A first upper chord steel pipe, a second upper chord steel pipe, a first connecting rod and a second connecting rodare adopted as a framework of a top plate, a first lower chord steel pipe, a second lower chord steel pipe, a third connecting rod and a fourth connecting rod are adopted as a framework of a bottom plate, web members are used as frameworks of web plates, the first upper chord steel pipe, the second upper chord steel pipe, the first lower chord steel pipe and the second lower chord steel pipe arefilled with concrete, concrete is poured outside the frameworks in an external covering mode, a continuous concrete slab is formed, a closed box-shaped section is formed to participate in stress, a truss is connected between the second upper chord steel pipe and the corresponding second lower chord steel plate to be used as an internal support of the box-shaped structure, hoisting anti-torque inertia moment is improved, and the internal truss does not need to be covered with concrete. The construction efficiency is effectively improved, the construction difficulty is reduced, the quality control process is reduced, external covering and arching are quick, the construction risk is reduced, the construction period is greatly shortened, and the construction cost is saved.