The invention relates to a smelting method of low phosphate steel. The method comprises the steps of molten iron desulphurization, waste steel adding and molten iron adding, converter primary blowing,deslagging, converter secondary blowing, and deslagging tapping. A double slag process is used for smelting, particularly, through control over the furnace inlet molten iron ratio and adoption of a material adding method, an oxygen supply method and a bottom blowing method which are matched, smelting of high-temperature high-carbon low phosphate steel is achieved; the smelting molten iron ratio is controlled according to the molten iron temperature and the molten iron silicon content, the primary blowing time is controlled to range from 5 min to 7 min, the variable gun variable oxygen pressure oxygen blowing mode is adopted, according to the molten iron silicon content, the lime adding amount is controlled, before secondary blowing gun lowering, a certain amount of temperature rising agent is added, the tapping temperature is controlled to be above 1670 DEG C, the tapping carbon content is controlled to above 0.1%, the process structure is adopted for producing, and the content of converter end point phosphorus is stably controlled to below 0.008%.