Building anti-seismic steel structure

The utility model belongs to the technical field of steel structures, and particularly relates to a building anti-seismic steel structure which comprises a cross beam and a stand column arranged on one side of the cross beam, and a buffering mechanism is arranged between the cross beam and the stand column. The buffering mechanism comprises a damping block arranged between the cross beam and the stand column and a connecting block which is fixed to the face, close to the damping block, of the cross beam and is of a T-shaped structure. The damper and the buffer pad can buffer impact force generated by vibration of the cross beam to the damping block, shock resistance of the steel structure is improved, the damping block and the stand column are prevented from being damaged by the impact force of the cross beam, meanwhile, a connecting mechanism is arranged, the second sliding block is limited through a limiting groove, a rotating handle can control the limiting block to fix the second sliding block, operation