The invention relates to an oxygen top blown converter steel making method, comprising the following steps: the steel material is added to a converter, oxygen is blown into the converter by an oxygen lance and auxiliary materials are added into the furnace by stages in the process of oxygen blowing; wherein the steel material comprises semisteel; lance position of the oxygen lance moves within 1.5-2.2m above molten steel liquid surface in the converter, wherein blowing beginning lance position is 1.95-2.05m, blowing lance position is 1.5-2.2m and catch carbon lance position is 1.7-1.75m; wherein, the auxiliary materials comprise compound slag, lime and high-magnesium lime; in every ton of semisteel, 17-20kg of the compound slag is used, 30-34.5kg of lime is used, 30-34.5kg of high-magnesium lime is used, a total of 43-53 cubic meters of oxygen is blown into the furnace; with the total content of the blown oxygen as a benchmark, the first batch of auxiliary materials are added when the oxygen blowing content is 0.8-2%; with the method of the invention adopted, steelmaking time can be reduced and slag splashing and drying can be effectively avoided in the process of steelmaking.