The invention provides a pure Chinese medicinal plaster for treating dysmenorrheal, which is prepared by repeated verification of clinical tests on the basis of the theory of traditional Chinese medical science. The plaster is prepared by processing pure Chinese medicinal herbs such as motherwort herb, dried ginger, Chinese mugwort leaf, cattail pollen, coix seed, nutgrass galingale rhizome, hawthorn fruit, cassia twig, trogopterus dung, Chinese angelica, peach seed, myrrh, medicinal evodia fruit, Szechuan lovage rhizome, cassia bark, chaff flower root, szechuan tangshen root, liquoric root, root of red-rooted salvia, combined spicebush root, frankincense, minium and the like. The pure Chinese medicinal plaster has the effects of promoting blood circulation and removing blood stasis, resolving stasis and eliminating stagnation, removing blood stasis and relieving pain, clearing and activating channels and collaterals, replenishing qi and promoting the production of body fluid and the like, acts on wounds of the dysmenorrhea directly, fully exerts the effects of nourishing blood and regulating menstruation, dissolving blood and resolving stasis, eliminating cold and promoting qi circulation, clearing and activating channels and collaterals, conditioning qi and blood and removing damp-heat, can ensure that the medicinal effect acts on lesion of uterine cavities to eliminate algomenorrhea completely, and has excellent curative effects on patients who suffer from abnormal menstruation. The regularity of a menstrual period is adjusted under the gradual action of medicines, so that a disordered menstrual period returns to normal gradually.