The invention discloses a galactopoietic medicament and a preparation method thereof. The galactopoietic medicament is prepared by taking Chinese angelica, white paeony root, Chinese thorowax root, pangolin scales (processed), cowherb seed, uniflower swisscentaury root, green tangerine peel, ricepaperplant pith, Mongolian snakegourd root and liquorice root as raw materials and combining the raw materials in a certain proportion. The preparation method comprises the steps of raw material preparation, high-temperature lixiviation and filtration, heating condensation, soft material preparation, granulation and drying, granule sieving and sealed package. Clinical tests show that the galactopoietic medicament has excellent therapeutic effect on hypogalactia caused by post-partum liver depression and Qi stagnation and can obviously increase the secretion of breast milk; and meanwhile, the galactopoietic medicament also has the functions of promoting mammary cell development and making breasts bigger and healthier.