Fabricated steel structure building

The utility model discloses an assembly type steel structure building which comprises a stand column, a cross beam and a movable wall body, a base, a tenon shoulder, a sliding groove and a steel bar groove are installed on the stand column, a tenon tongue, a clamping lock and a sliding groove are arranged on the cross beam, and a sliding table and a fixing anchor hole are arranged on the movable wall body. The stand columns and the cross beams are connected together through mortise and tenon joint structures to jointly form a building frame, after the building frame is installed, reinforcing steel bars penetrate through the reinforcing steel bar grooves to fix the whole frame, and the movable wall body is installed in the sliding grooves in the building frame through the sliding tables to form the wall body of the building. According to the utility model, a Chinese traditional tenon-and-mortise structure is adopted for connection, welding or screw reinforcement is not needed during installation, the installat