Steel structure composite beam for fabricated building

The utility model discloses a fabricated building steel structure composite beam which comprises a beam body and a plurality of positioning seats, the positioning seats are uniformly and fixedly mounted on one side wall of the beam body, longitudinally arranged elastic telescopic iron columns are mounted on the positioning seats, inner cavities are formed in the positioning seats, and the inner cavities are communicated with the positioning seats. A plurality of outer groove bodies are formed in the top of the beam body and the bottom of the beam body, one end of each outer groove body communicates with the inner cavity, and an elastic movable magnetic base is arranged in each outer groove body; a plurality of positioning groove bodies are uniformly formed in one side of the beam body, positioning holes are formed in the beam body, and the positioning holes are communicated with the positioning groove bodies. The combined beam has the beneficial effects that through the design of the two ends of the combined