By reasonably controlling the vacuum degree, oxygen supply intensity, oxygen lance position, and other process parameters of Vacuum Oxygen Decarburization (VOD) refining furnace (60t), and according to the blowing situation, combined with the oxygen concentration difference potential, exhaust gas temperature and CO concentration, accurately determine the blowing end point, and then further remove inclusions in steel by Electro-Slag Remelting (ESR), making the end point C less than or equal to 0.06 %, the total content of (As + Sn + Pb + Sb + Bi) is less than or equal to 150 ppm, total oxygen content is less than or equal to 30 ppm. The content of class A, B, C and D inclusions is less than or equal to grade 1.0 and the total inclusion grade is less than or equal to grade 2.0.