Fabricated steel beam

The utility model relates to the technical field of steel beams, in particular to an assembly type steel beam which comprises a vertical beam, a triangular inclined supporting plate for stable supporting is fixedly connected to the front face of the vertical beam, a cross beam is placed on the top of the triangular inclined supporting plate, and two limiting mechanisms are arranged on the top of the triangular inclined supporting plate. And two limiting assemblies are arranged at the top of the triangular inclined supporting plate, each limiting mechanism comprises a box fixedly connected with the top of the triangular inclined supporting plate, a rotating rod is rotationally connected to the top of each box, and a first bevel gear is fixedly connected to the bottom of each rotating rod. According to the assembly type steel beam, by arranging the limiting mechanism, the assembly type steel beam has the limiting function, the effect of limiting the cross beam is achieved, and therefore the cross beam can be co