The invention discloses a new Chinese medicinal composition for treating dysmenorrhea and a preparation method thereof. The Chinese medicinal composition mainly comprises the following raw material medicaments: root of red-rooted salvia, yanhushuo, fenugreek lysimachia, benzoin, rosewood heart wood, storax, safflower, peach seed, divaricate saposhnikovia root, cassia twig, szechuan lovage rhizome, dried orange peel, immature bitter orange, costustoot, rhizome of nutgrass flatsedge, szechwan chinaberry fruit, radix curcumae, combined spicebush root, longstamen onion bulb, aspongopus, honey-fried frankincense, honey-fried myrrh, leonurus heterophyllus, hiraute shiny bugleweed herb, twotooth achyranthes root, cowherb seed, ground beeltle, raw astragalus, radix rehmanniae praeparata, dragon's blood, honey-fried pangolin scales and the like. The Chinese medicinal composition of the invention can be prepared into any common oral administration preparation according to the conventional method of Chinese medicinal preparations. The Chinese medicinal composition can improve symptoms such as dysmenorrheal, menstrual stomachache, tumescence in chest and hypochondrium, scurrying pain in hypogastrium, irritable mood, emotional instability and the like obviously, and has the advantages of definite clinical effect, obvious curative effect and quick response. The Chinese medicinal composition also has the advantages of low cost, no toxic or side effect and the like.