Method for preparing sodium ozagrel freeze-dried powder injection

The invention provides a method for preparing a sodium ozagrel freeze-dried powder injection. The method comprises the following steps: a) mixing ozagrel, a sodion-containing alkaline matter and first injection water, and conducting pH value adjustment and adsorption treatment in sequence to obtain a mixed solution A; b) mixing the mixed solution A with second injection water, and conducting refrigeration and drying in sequence so as to obtain the sodium ozagrel freeze-dried powder injection; the volume ratio of the first injection water to the second injection water is 6:(3-5). Compared with the prior art, the provided preparation method can effectively control the content of impurities in the sodium ozagrel freeze-dried powder injection, and can improve the quality stability of the product. Experiment results show that the content of the impurities in the sodium ozagrel freeze-dried powder injection obtained by the provided preparation method is 0.3% or below.