The invention discloses a new Chinese medicinal composition for treating edema during menstruation and a preparation method thereof. The Chinese medicinal composition mainly comprises the following raw material medicaments: ephedra herb, cassia twig, dried ginger, mint, cicada slough, bupleurum, mongolian snakegourd root, baical skullcap root, golden thread, ash bark, lightyellow sophora root, densefruit pittany root-bark, honeysuckle, weeping forsythia, mongolian dandelion herb, gentiana macrophylla pallac, Indian buead, lycium bark, rhubarb, radish seed, swordlike atractylodes rhizome, officinal magnolia bark, manshurian dutchmanspipe stem, plantain seed, coix seed, oriental waterplantain rhizome, pyrrosia leaf, longhairy antenoron herb, immature bitter orange, costus root and the like. The Chinese medicinal composition can be prepared into any common oral preparation by the conventional method for preparing the traditional Chinese medicinal preparation. The Chinese medicinal composition can improve symptoms such as asthenia of lower limbs, malleolus tibiae, insteps and the like before and after menstruation or during menstrual periods, identation by pressing, fatigue and ponderosity of legs, edema in eyelids, faces and even whole bodies and the like, and has the advantages of definite and obvious curative effect, quick response, low cost, no toxic or side effect and the like.