The invention discloses a precast ribbed bottom board concrete superposition board comprising a precast ribbed bottom board provided with a concrete superposition board body. The precast ribbed bottom board comprises a bottom board body which is a prestress inverted-T-shaped thin board. A plurality of high-strength prestress steel wires are arranged on the bottom board body longitudinally. The bottom board body is evenly provided with a plurality of rib boards. The rib boards are provided with a plurality of first holes formed in the horizontal direction in a linear array. The first holes are provided transverse perforated rebars with the diameter of 10 mm. The concrete superposition board body is a layer of cast-in-place superposition layer concrete. The distance between the top face of the concrete superposition board body and the top face of the precast ribbed bottom board is 25 mm, 15 mm of the distance is left after the rebars with the diameter of 10 mm are placed, and the requirements for the protective layer thickness of specifications are met. When the precast ribbed bottom board concrete superposition board is constructed, additional formworks and supports are hardly needed, construction progress is fast, cost is low, low energy consumption and low pollution of a project are achieved, resources are saved, and the environment is protected.