Steel structure fabricated building floor support plate support-free device

The utility model relates to a steel structure assembly type building floor support plate support-free device which is installed below a steel truss floor support plate cantilever steel beam part and comprises a base and a positioning reinforcing plate, a liftable supporting rod is vertically installed on the base, and a supporting seat used for supporting a floor support plate cantilever part is installed at the upper end of the supporting rod. The positioning reinforcing plate is fixed on the steel beam in advance, the positioning reinforcing plate is connected with the supporting rod through a connecting plate, and the two ends of the connecting plate are hinged to the positioning reinforcing plate and the supporting rod through detachable pin shafts respectively. According to the structure, the construction efficiency is greatly improved, after concrete meets the strength, the concrete can be dismounted without damage and can be directly used for construction of other floors as a turnover material, and th