The invention discloses an application of a traditional Chinese medicine composition in the preparation of medicines for preparing diabetic ketoacidosis complicated with leukemoid reaction. The traditional Chinese medicine composition comprises herbal medicines such as ginseng, rhizoma polygonati, rhizoma atractylodis, radix sophorae flavescentis, poria cocos, dwarf lilyturf tuber, prepared fleeceflower root, rehmannia root, dogwood, coptidis rhizoma and fortune eupatorium herb. The traditional Chinese medicine composition is mainly used for tonifying qi and yin, strengthening spleen and transferring body fluid, and has the effects of clearing away heat, eliminating dampness and promoting blood circulation to remove meridian obstruction. After the traditional Chinese medicine composition is taken, the dosage of insulin used by patients is gradually reduced, the blood glucose control is normal and stable, the time of urine acetone bodies turning to negative is obviously shortened, and the state of illness can be controlled as soon as possible.