The invention discloses a fabricated steel structure containing a replaceable beam end rotating energy dissipation hinge and a small inclined-span lariat. The fabricated steel structure comprises fabricated steel beams, fabricated steel columns, dampers, joint plates, bolt pins, lug plates, lower connecting rods, upper connecting rods, ladder type haunched beams, bolts, end plates, front and rear cover plates, rotating plates, annular grooves, shearing blocks, shearing keys, rotating shafts, flange notches and web rib strips. A plastic-hinge region is locally weakened through the beam end rotating energy dissipation hinge of the fabricated steel structure; not only is the design concept of strong columns and weak beams reflected, but also the energy of the structure is dissipated through shearing deformation; while providing resist lateral stiffness for the structure, a small inclined-span lariat energy dissipation device conducts full energy dissipation of the dampers by enlarging horizontal displacement; and the fabricated steel structure is definite in energy dissipation mechanism and has strong energy dissipation capacity under the moving action of an earthquake, main damage and destroy of the steel structure can be alleviated, and the structure is easy to replace after the earthquake or the damage.