A manufacturing method of a brake disc for railroad vehicles, comprising a discbody formed in a shape of a disc, a bore part centrally formed at the disc body, a fixing part coupled to a hub by being protrusively formed at a center of the bore part, a plurality of fixing holes screw-connected to the hub by being formed at the fixing part, and a staircase protrusively formed at a distal end of a surface of the fixing part, the method comprising: a ring rolling process of processing, in a ring shape, a structure comprised of carbon 0.20∼0.3 weight %, silicon 0.4 ∼ 0.7 weight %, manganese 0.35 ∼ 0.80 weight %, phosphorus less than 0.03 weight %, sulfur less than 0.03 weight %, nickel 0.5 ∼ 0.01 weight %, chrome 1.0∼1.5 weight %, molybdenum 0.7 ∼ 1.30 weight %, copper 0.3 ∼ 0.01 weight %, vanadium 0.2∼0.3 weight %, and rest being of iron; a first heat treatment process of performing a normalizing treatment of a structure processed through the ring rolling process; a first mechanical process of processing a surface of the structure finished with the first heat treatment process; an inspection process of inspecting an inside defect through a non-destructive inspection of the structure finished with the first mechanical process; performing a heat treatment of the structure finished with the inspection process; and a second mechanical process of processing the structure in a final disc shape, wherein the ring rolling process includes forming an ingot using a billet under a temperature of 1,200 C°∼1, 250 C°, cutting the billet to a plurality of pieces, upsetting the cut billet, and forming the upset billet in a disc shape having a bore through a ring rolling device by piercing a center, wherein the first heat treatment process is performed by air cooling after heating for 5∼6 hours under 970C°∼1,000C°, and wherein the second heat treatment process includes a quick cooling with water after heating for 4.5∼5.5 hours under 940C°∼960C° during quenching and an air cooling after heating for 8∼10 hours under 620C°∼660C° during annealing. a ring rolling process of processing, in a ring shape, a structure comprised of carbon 0.20∼0.3 weight %, silicon 0.4 ∼ 0.7 weight %, manganese 0.35 ∼ 0.80 weight %, phosphorus less than 0.03 weight %, sulfur less than 0.03 weight %, nickel 0.5 ∼ 0.01 weight %, chrome 1.0∼1.5 weight %, molybdenum 0.7 ∼ 1.30 weight %, copper 0.3 ∼ 0.01 weight %, vanadium 0.2∼0.3 weight %, and rest being of iron; a first heat treatment process of performing a normalizing treatment of a structure processed through the ring rolling process; a first mechanical process of processing a surface of the structure finished with the first heat treatment process; an inspection process of inspecting an inside defect through a non-destructive inspection of the structure finished with the first mechanical process; performing a heat treatment of the structure finished with the inspection process; and a second mechanical process of processing the structure in a final disc shape, wherein the ring rolling process includes forming an ingot using a billet under a temperature of 1,200 C°∼1, 250 C°, cutting the billet to a plurality of pieces, upsetting the cut billet, and forming the upset billet in a disc shape having a bore through a ring rolling device by piercing a center, wherein the first heat treatment process is performed by air cooling after heating for 5∼6 hours under 970C°∼1,000C°, and wherein the second heat treatment process includes a quick cooling with water after heating for 4.5∼5.5 hours under 940C°∼960C° during quenching and an air cooling after heating for 8∼10 hours under 620C°∼660C° during annealing.