The invention discloses a smelting method for complete-flow low-oxygen-level producing of IF steel, and belongs to the technical field of steel smelting. The method comprises the steps that firstly, after converter steel smelting is finished, deslagging is carried out, 10 to 15 tons of slag is left in a converter, 50 to 100 kg of coke powder is added for removing oxygen in the slag, and the slag-splashing furnace protection operation is carried out; secondly, converter charging is carried out; thirdly, converter main blowing is carried out; fourthly, after converter main blowing is finished, through an auxiliary gun, the molten steel temperature and the carton content are measured, and according to the measuring value, auxiliary oxygen blowing amount is controlled; fifthly, after auxiliaryblowing is finished, before tapping, strong bottom blowing is carried out for 30 seconds; sixthly, converter tapping is carried out; seventhly, molten steel enters in the RH procedure; and eighthly,after a steel ladle is jacked, a vacuum pump is started for vacuum pumping decarburization. The converter tapping molten steel peroxidation degree is reduced, the steel ladle slag oxidation is reduced, the generation amount of deoxidation type inclusions Al2O3 can be reduced, the molten steel cleanliness level is improved, the cost is reduced, and the obvious economic benefits are achieved.