The invention relates to a control method for improving the blowing end point temperature of a steelmaking converter, and belongs to the field of converter steelmaking. The control method comprises the following steps: firstly, according to the temperature and composition of molten iron entering a converter, the amount of slag in the molten iron, and residue from the batch before in the converter,determining the appropriate amount of steel scrap cold charge to be added, and the type and quantity of the first batch of blowing materials, and at the end of silicon and manganese oxidation period,ensuring that the alkalinity of steel slag ranges from 1.1 to 1.8, the content of MgO in the slag is 4.0%-6 .5%, the content of TFe in the slag is 15%-23% and the molten iron temperature ranges from1385 DEG C to 1425 DEG C; then, at the first carbon phosphorus oxidation reaction selection point, adding slag material containing calcium and magnesium and cold charge of iron-containing oxides in batches for multiple times, and at the second carbon phosphorus oxidation reaction selection point, ensuring that the alkalinity of steel slag ranges from 2.7 to 3.4. the content of MgO in the slag ranges from 7.5% to 10.5%, and the content of TFe in the slag ranges from 13% to 19%; and carrying out spraying operation at the late of blowing. The control method ensures that the slagging reaction in the whole process of converter blowing is compatible with the reaction process of molten iron, stabilizes the heat dissipation coefficient and the heating rate in the process of converter blowing, andimproves the ability to control the blowing end point temperature of the steelmaking converter.