The invention provides hot-formed steel directly rolled from a medium-
thin sheet billet and having the tensile strength equal to or higher than 1300 MPa. The hot-formed steel comprises, by weight, 0.17%-0.20% of C, 0.21%-0.25% of Si, 1.0%-1.3% of Mn, 0-0.01% of P, 0-0.008% of S, 0.015%-0.060% of Als, 0.19%-0.24% of Cr, 0.021%-0.025% of Ti, or 0.021%-0.025% of Nb, or 0.021%-0.025% of V or the mixture of any two of Ti, Nb and V according to any proportion, 0.002%-0.003% of B, 0.14%-0.16% of Mo, and 0-0.005% of N. A production method comprises the steps of molten iron desulphurization,
smelting and refining in an electric furnace or a converter,
continuous casting, descaling treatment before molten iron enters a soaking pit, soaking, heating, high-pressure water descaling before the molten iron enters a
rolling mill, rolling, cooling, reeling, austenitizing, stamp-forming through a die, and
quenching. According to the hot-formed steel directly rolled from the medium-
thin sheet billet and having the tensile strength equal to or higher than 1300 MPa and the production method, the procedure is short, the surface quality of a product is good, the thickness precision is high, the requirement for the quality of cold-rolled products can be met, and complex deformation can be completed successfully; and in addition, restoration after deformation is avoided, and the
dimensional precision of parts is high.