The invention discloses a bolted steel grating comprising a plurality of flat bars (1), a plurality of twisted square bars (2), two edge steels (3) and two positioning flat bars (4). The twisted square bars (2) are transversely arranged on and fixed in a pressure welding manner on the flat bars (1) arrayed evenly according to predetermined intervals, and the edge steels (3) are welded on two end faces of the flat steels (1); the positioning flat steels (4) are transversely arranged on and welded to bottoms of two ends of the flat steels (1), at least two through holes (40) used for fitting tightening bolts to fix the steel grating are formed in each positioning flat steel (4), and the tightening bolts can penetrate the through holes (40) to fix the steel grating. According to the bolted steel grating, each bottom of two ends of the flat steels is welded to one positioning flat steel, at least two through holes are formed in each positioning flat steel, the tightening bolts can penetrate the through holes to fix the steel grating, fitting and removal are facilitated, and structure is stable.