A method for producing grain-oriented silicon steel with single cold rolling, comprising: 1) smelting, in which after secondary refining of molten steel in a converter or an electric furnace, a casting blank is produced by continuous casting, characterized by the composition of the blank, based on mass: C 0.035-0.065 %, Si 2.9-4. 0%, Mn 0.08-0.18 %, S: 0.005-0.012 %, Als: 0.015-0.035 %, N: 0.0050-0.0130 %, Sn 0.001-0.15 %, P 0.010-0.030 %, Cu 0.05-0.60 %, Cr < 0.2 %, optional Mo 0.01-0.10 % and/or Sb < 0.2 %, balanced by Fe, unavailable inclusions and unavoidable impurities, the casting blank has a thickness in the range of 200-250 mm, 2) hot rolling, during which the casting blank is heated to 1090-1200 °C in a heating furnace, subjecting the heated casting blank to rolling which begins at a temperature below 1180°C and ends at a temperature above 860°C to produce a hot rolled sheet of 1.5-3.5 mm, and coiling at 500-650°C; 3) normalization, during which normalizing annealing is carried out at an annealing temperature of 1050-1180 °C for 1-20 s and at 850-950 °C for 30-200 s, followed by cooling a rate of 10-60 °C/s; 4) cold rolling, during which single cold rolling with a reduction rate of 75-92 % produces the steel sheet with the final thickness, 5) decarburization, during which the steel sheet that is rolled to the final thickness is subjected to decarburizing annealed wherein the decarburizing temperature is in the range of 780-880 °C, the dew point of the protective atmosphere is 40-80 °C, the decarburizing time is 80-350 s, and the protective mixed gas atmosphere is a mixture of H 2 and N 2, with the amount of H 2 in the range of 15-85 %; and wherein the total oxygen in the surface of the decarburized sheet is 171/1< < 313/t, and the amount of absorbed nitrogen is 2-10 ppm, wherein t represents the actual thickness of the steel sheet in mm, followed by coating it, with a high-temperature annealing separator comprising MgO as the main component; 6) high-temperature annealing, in a protective annealing atmosphere at a temperature below 1000°C with a temperature holding time of 6-30 h, wherein the protective atmosphere is comprised of a mixed gas of H 2 and N 2 or pure N 2 and has a dew point of 0-50 °C; wherein the amount of absorbed nitrogen during high-temperature annealing is 10-40 ppm; 7) subjecting to a conventional hot levelling process. 1) smelting, in which after secondary refining of molten steel in a converter or an electric furnace, a casting blank is produced by continuous casting, characterized by the composition of the blank, based on mass: C 0.035-0.065 %, Si 2.9-4. 0%, Mn 0.08-0.18 %, S: 0.005-0.012 %, Als: 0.015-0.035 %, N: 0.0050-0.0130 %, Sn 0.001-0.15 %, P 0.010-0.030 %, Cu 0.05-0.60 %, Cr < 0.2 %, optional Mo 0.01-0.10 % and/or Sb < 0.2 %, balanced by Fe, unavailable inclusions and unavoidable impurities, the casting blank has a thickness in the range of 200-250 mm, 2) hot rolling, during which the casting blank is heated to 1090-1200 °C in a heating furnace, subjecting the heated casting blank to rolling which begins at a temperature below 1180°C and ends at a temperature above 860°C to produce a hot rolled sheet of 1.5-3.5 mm, and coiling at 500-650°C; 3) normalization, during which normalizing annealing is carried out at an annealing temperature of 1050-1180 °C for 1-20 s and at 850-950 °C for 30-200 s, followed by cooling a rate of 10-60 °C/s; 4) cold rolling, during which single cold rolling with a reduction rate of 75-92 % produces the steel sheet with the final thickness, 5) decarburization, during which the steel sheet that is rolled to the final thickness is subjected to decarburizing annealed wherein the decarburizing temperature is in the range of 780-880 °C, the dew point of the protective atmosphere is 40-80 °C, the decarburizing time is 80-350 s, and the protective mixed gas atmosphere is a mixture of H 2 and N 2, with the amount of H 2 in the range of 15-85 %; and wherein the total oxygen in the surface of the decarburized sheet is 171/1< < 313/t, and the amount of absorbed nitrogen is 2-10 ppm, wherein t represents the actual thickness of the steel sheet in mm, followed by coating it, with a high-temperature annealing separator comprising MgO as the main component; 6) high-temperature annealing, in a protective annealing atmosphere at a temperature below 1000°C with a temperature holding time of 6-30 h, wherein the protective atmosphere is comprised of a mixed gas of H 2 and N 2 or pure N 2 and has a dew point of 0-50 °C; wherein the amount of absorbed nitrogen during high-temperature annealing is 10-40 ppm; 7) subjecting to a conventional hot levelling process.