Reinforced building steel structure

The utility model relates to the technical field of building steel structures, and discloses a reinforced building steel structure which comprises a supporting column body, a horizontal cross beam body is movably arranged on the side wall of the supporting column body, a rectangular side groove is formed in the side wall of the supporting column body, a side block is fixed to the side end of the cross beam body, and the side block is movably arranged in the side groove. The outer side of the top of the supporting column body is movably sleeved with a vertical sleeve, a reinforcing box is fixed to the side end of the sleeve, a rectangular fixing hole is formed in the middle of the bottom wall of the reinforcing box, a fixing block is fixed to the top end of the beam body and movably arranged in the fixing hole, and fixing grooves are formed in the side walls of the two sides of the fixing block. The steel structure beam is reasonable in structure, the steel structure beam does not need to be fixedly installed