The invention discloses a mistura with effects of resolving hard mass and promoting lactation and a preparation method thereof, belonging to the field of traditional Chinese medicine. The composition is used for treating postpartum hypogalactia and breast milk silting-up and prepared by the following raw materials according to parts by weight: 30 parts of membranous milkvetch root, 15 parts of Chinese angelica, 15 parts of largehead atractylodes rhizome, 10 parts of beautiful sweetgum fruit, 10 parts of Chinese thorowax root, 6 parts of bitter orange (stir-fried, broken), 6 parts of pangolin scales, 10 parts of cowherb seed, 10 parts of uniflower swisscentaury root, 6 parts of Szechuan lovage rhizome, 15 parts of pilose Asiabell root, 10 parts of akebia stem, 10 parts of liquoric root and 600 parts of front pig trotters, the front pig trotters are stewed, then soup is used for decoction, and the mistura is prepared by concentration, bottling and disinfection. The invention can also make the addition and the subtraction based on the basic formula according to the symptoms. The mistura has low price, simple operation, convenient administration and no toxic side effects. The mistura can be made by patients, the cure rate for a variety of lack of milk, rare breast milk and breast duct blockage is 98.2 percent and the total effective rate is 100 percent. Compared with the other drugs at present, the effect is extremely significant.