The invention discloses a single-layer anti-impact separation device for producing a steel structure. The single-layer anti-impact separation device for producing the steel structure comprises a bottom plate, two vertical plates, a top plate, an anti-collision layer, a plurality of cushion blocks, a plurality of side buffer blocks and a top buffer block, wherein the anti-collision layer is fixedlyconnected to the top of the bottom plate; the plurality of cushion blocks are fixedly connected to the surfaces of the inner sides of the two vertical plates; the plurality of side buffer blocks arearranged among the plurality of cushion blocks; and the top buffer block is fixedly connected with the bottom of the top plate and faces a separation space. Through the abovementioned manner, according to the single-layer anti-impact separation device for producing the steel structure, the anti-impact and anti-collision performance of the separation device is greatly improved through the cooperative use of the anti-collision layer, the cushion blocks, the side buffer blocks and the top buffer block; and the separation device is novel in structure, simple and convenient to operate, rapid in separation, safe and anti-collision, good in buffer performance, high in separation efficiency, and time-saving and labor-saving, and has a wide market prospect in popularization.