The invention relates to a freeze-drying ropivacaine hydrochloride composition for injection and a quality control method thereof. The composition is prepared from ropivacaine hydrochloride and lactose, for example, the composition is prepared from, by weight, 75 parts of ropivacaine hydrochloride and 20-60 parts of lactose. The composition is basically prepared through the following steps that ropivacaine hydrochloride and lactose are weighed according to the amount in the prescription, a proper amount of injection water is added, and stirring is carried out to dissolve the mixture; active carbon is added in the medicine liquor obtained in the last step, stirring is carried out, and filtering is carried out to remove carbon; injection water is supplemented to the full amount of the prescription, the mixture is stirred evenly, the pH value of the solution is measured, the content of active ingredients is optionally measured, and the pH is regulated with an acid-base regulator if necessary; the medicine liquor is sterilized, filtered and then poured into penicillin bottles; freeze-drying is carried out to remove moisture, plugs are pressed, and the freeze-drying ropivacaine hydrochloride composition is obtained. The freeze-drying ropivacaine hydrochloride composition has the excellent pharmaceutical properties stated in the description, and the quality control method has excellent methodological performance.