The invention discloses a novel Chinese medicinal composition for treating hypomenorrhea and a preparation method thereof. The Chinese medicinal composition mainly comprises the following raw materials: raw radix astragali, codonopsis pilosula, white paeony root, rhizoma dioscoreae, Chinese angelica, red peony root, prepared rehmannia root, ginseng, grassleaf sweelflag rhizome, benzoin, the tuberof multiflower knotweed, motherwort, medlar, the stem of noble dendrobium, radix polygonati officinalis, glossy privet fruit, tortoise plastron, turtle shell, radix curcumae, dried tangerine, cyperusrotundus, and the like. The Chinese medicinal composition can be prepared into common oral preparations by the regular Chinese medicament preparation method. The Chinese medicinal composition can obviously improve deficiency of the blood and hypomenorrhea caused by body weakness, serious illness and long illness, blood loss or diet and over-fatigue causing impairment of the spleen, or sexual strain causing impairment of the kidney, or can improve the hypomenorrhea and other symptoms caused by internal retention of blood stasis, phlegm-dampness stagnation, obstruction of channels, and hematogenous blockage. The Chinese medicinal composition has the advantages of exact clinical curative effects, obvious curative effects, quick response, low cost, substantially no toxic or side effects, and the like.