Fabricated building steel structure

The utility model belongs to the technical field of steel structures, and particularly relates to an assembly type building steel structure which comprises a steel structure body, two positioning rods are arranged outside the steel structure body, two symmetrically-distributed inserting holes are formed in the inner sides of the positioning rods, two inserting grooves are formed in the inner side of the steel structure body, and a groove is formed in the top of the steel structure body. Two springs are fixedly connected to the inner sides of the grooves, sliding plates are fixedly connected to the ends, away from the grooves, of the springs, connecting rods are slidably connected to the outer portions of the sliding plates, two inserting rods are fixedly connected to the outer portions of the sliding plates, clamping plates are inserted to the outer portions of the inserting rods, clamping grooves are clamped to the outer portions of the clamping plates, and two fixing rods are fixedly connected to the bottom