A smelting method for an ultra-low carbon 13Cr stainless steel having ≤ 0.03 % by mass of C and 12.5-13.5 % by mass of Cr, characterized in that the smelting method does not involve a calcium treatment step and comprises the steps of: subjecting molten steel to drossing and then VOD smelting, wherein the initial temperature of the molten steel is 1600-1650 °C, and the vacuum degree during the VOD smelting is < 100 Pa; carrying out an oxygen blowing decarburization treatment, wherein the amount of blown oxygen is controlled to 4-6.5 Nm 3 /t; carrying out a vacuum carbon deoxidation under high vacuum condition, wherein the high vacuum pressure is < 500 Pa; wherein the time of the treatment of the vacuum decarburization is 10-20 min, and after the vacuum decarburization treatment is completed, the temperature of the molten steel is 1650-1680 °C; carrying out vacuum slagging and deoxygenation, wherein the basicity of a slag defined as a CaO/SiO 2 content ratio is 5-10, and the mass ratio of CaO to Al 2 O 3 in the slag is 1.6-2.4, wherein lime, composite slagging balls, aluminum blocks and ferrosilicon are used for slagging and deoxygenation, wherein the composition of the composite slagging balls is made up of the following components: in percentage by mass, 30-40 % of Al 2 O 3, 40-50 % of CaO, 5-20 % of SiO 2, and 6-12 % of MgO, wherein the addition amount of the composite slagging balls is 20-40 % of that of the lime, and wherein the vacuum pressure is controlled to < 2000 Pa and the treatment time is 10-15 min; carrying out vacuum breaking, wherein aluminum wires are fed in this step, and wherein the mass percentage of aluminum is controlled at 0.03-0.06 %; carrying out a vacuum treatment, wherein the vacuum pressure is < 2000 Pa, the treatment time is 5-15 min, and the temperature of the molten steel after the treatment is completed is 1560-1580 °C; and carrying out secondary vacuum breaking; wherein in steps,, and, the flow rate of argon gas for bottom blowing stirring is controlled to 200-1000 NL/min. subjecting molten steel to drossing and then VOD smelting, wherein the initial temperature of the molten steel is 1600-1650 °C, and the vacuum degree during the VOD smelting is < 100 Pa; carrying out an oxygen blowing decarburization treatment, wherein the amount of blown oxygen is controlled to 4-6.5 Nm 3 /t; carrying out a vacuum carbon deoxidation under high vacuum condition, wherein the high vacuum pressure is < 500 Pa; wherein the time of the treatment of the vacuum decarburization is 10-20 min, and after the vacuum decarburization treatment is completed, the temperature of the molten steel is 1650-1680 °C; carrying out vacuum slagging and deoxygenation, wherein the basicity of a slag defined as a CaO/SiO 2 content ratio is 5-10, and the mass ratio of CaO to Al 2 O 3 in the slag is 1.6-2.4, wherein lime, composite slagging balls, aluminum blocks and ferrosilicon are used for slagging and deoxygenation, wherein the composition of the composite slagging balls is made up of the following components: in percentage by mass, 30-40 % of Al 2 O 3, 40-50 % of CaO, 5-20 % of SiO 2, and 6-12 % of MgO, wherein the addition amount of the composite slagging balls is 20-40 % of that of the lime, and wherein the vacuum pressure is controlled to < 2000 Pa and the treatment time is 10-15 min; carrying out vacuum breaking, wherein aluminum wires are fed in this step, and wherein the mass percentage of aluminum is controlled at 0.03-0.06 %; carrying out a vacuum treatment, wherein the vacuum pressure is < 2000 Pa, the treatment time is 5-15 min, and the temperature of the molten steel after the treatment is completed is 1560-1580 °C; and carrying out secondary vacuum breaking;