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The technical scheme is: a dry-connected prefabricated assembled steel-concrete composite beam, including steel beams, concrete slabs composed of steel bars and concrete, and steel plate connectors composed of steel plates, shear connectors and connecting rods. It is characterized in that: It also includes a pair of inter-plate connectors composed of upper connecting plates, lower connecting plates, horizontal connecting plates, triangular stiffening steel plates and first and second shear connectors, the upper surface of the horizontal connecting plate is vertically connected with an upper connecting plate and a first shear connector, the lower surface is vertically connected with a lower connecting plate, a triangular stiffening steel plate is welded between the lower surface of the horizontal connecting plate and the side of the lower connecting plate, and the second shear connector is horizontally connected on one side of the upper connecting plate.

The two ends of the steel bar preset in the concrete slab are respectively threaded, and the threaded ends of the steel bar respectively pass through the bolt holes and working holes opened at the upper end of the upper connecting plate in the pair of plate connectors corresponding to the second shear connector, and are fixed by nut connection. The shear connector in the steel plate connector is centered under the transverse preset steel bar in the concrete slab, and the horizontally arranged steel plate is parallel to the horizontal connecting plate in the pair of plate connectors. Concrete is poured and the preset steel bar in the concrete slab, the first and second shear connectors in the pair of plate connectors and the shear connectors in the steel plate connector are wrapped and connected in the concrete slab by the concrete to form a steel-concrete prefabricated assembly.

The steel-mixed prefabricated assembly is connected to the steel beam by connecting the connecting rod vertically arranged under the steel plate in the steel plate connector, which is connected to the steel beam, I .e. the steel-mixed combination beam unit, also known as the steel-mixed combination beam.