The invention discloses a process for directly preparing 4N-grade strontium nitrate. The process comprises the steps: carrying out separation by taking a strontium nitrate enrichment solution as a feed liquid, naphthenic acid as an extractant and TOP as a demulsifier to remove aluminum and iron serving as impurity elements in the strontium nitrate enrichment solution; and carrying out separation by taking P507 as an extractant to remove chlorine, sodium, potassium, beryllium, magnesium, calcium, barium, lead, cadmium and zinc serving as the rest impurity elements in the strontium nitrate enrichment solution. The process specifically comprises the eight steps: a saponification stage I, quasi-fractional extraction separation of Sr/AlFe, a reverse extraction stage I, a saponification stage II, fractional extraction separation of ClNaKBeMgCaSr/SrBaPbCdZn, fully-loaded quasi-fractionation extraction separation of ClNaKBeMgCa/Sr, fractional extraction separation of Sr/BaPbCdZn and a reverseextraction stage II. The purity of strontium in a 4N-grade strontium nitrate solution prepared by using the process is 99.991%-99.998%, and the yield of strontium in the 4N-grade strontium nitrate solution is 95%-99%. The process has the advantages that the material basis is laid for preparing a 4N-grade strontium product, and the process is high in product purity and yield, low in reagent consumption, high in separation efficiency, short in process flow and low in production cost.