The invention discloses a factory-made orthotropic steel plate and composite combined deck structure. The deck structure comprises an orthotropic steel plate (1), a composite layer (2) and a wearing layer (3), wherein the upper side of the orthotropic steel plate (1) is provided with the composite layer (2) and the wearing layer (3) in sequence; the composite layer (2) is mutually connected with the orthotropic steel plate (1) below the lower side of the composite layer (2) through resin; the top face of the composite layer (2) is provided with a rough surface layer (4); and the wearing layer (3) is cast at the upper side of the rough surface layer (4). Through additionally installing the composite layer between the orthotropic steel plate and the wearing layer, the deck structure disclosed by the invention is light in weight, high in strength, high in rigidity, good in peeling resistance, moisture resistance and corrosion resistance and high in high-temperature stability and low-temperature anti-cracking performance and has the outstanding features that assembly construction is simple and rapid; water is resisted; a pavement layer is prevented from being cracked; and the orthotropic steel deck structure is prevented from being corroded. The factory-made orthotropic steel plate and composite combined deck structure is suitable for building and repairing various steel deck structures.