Technique for directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace

The invention provides a technique for dephosphorizing blast furnace iron melt in a furnace and directly smelting stainless steel, and the technique comprises following steps: firstly, dephosphorizing raw material iron melt which contains nickel and chrome in a blast furnace, enabling the content of phosphor to be lower than 0.035%, adding quick lime slag 3-18% into molten steel each ton, secondly, adding nitrogen gas or argon gas and oxygen to use together, wherein the blowing oxygen quantity of the molten steel each ton is 0.8-2 cubic meters, the argon gas is 0.4-1.2 cubic meters, the nitrogen gas is 0.5-1.5 cubic meters, obtaining finished products, adding stainless steel pregnant antimony solution, and outputting the molten steel after the content of main components of the molten steel in an electric furnace reaches the following standards through slightly mixing. The standards are that chrome is 8-18%, nickel is 0.8-8.5%, manganese is 5.5-14%, copper is 1.5-3.2%, carbon is less than 0.15%, silicon is les