The invention discloses a bone fracture medicinal patch and a preparation method thereof, which belong to the field of external Chinese patent medicaments. The bone fracture medicinal patch comprises a Chinese medicinal formula, a substrate material, a back lining layer and a supporting layer, wherein the formula consists of the following components in parts by weight: 10 parts of Chinese angelica, 10 parts of szechuan lovage rhizome, 10 parts of common bletilla tuber, 10 parts of ground beetle, 20 parts of pseudo-ginseng root, 10 parts of cortex eucommiae, 10 parts of tree peony root-bark, 20 parts of sappan wood, 10 parts of suberect spatholobus stem, 20 parts of fortune's drynaria rhizome, 10 parts of himalayan teasel root, 20 parts of astragalus, 20 parts of sealwort, 10 parts of double-teeth pubescent angelica root, 20 parts of frankincense, 80 parts of myrrh, 20 parts of safflower, 20 parts of twotooth achyranthes root, 5 parts of native copper, 2 parts of dragon's blood, 20 parts of common selfheal fruit-spike, 20 parts of fenugreek seed, 20 parts of epimedium herb, 20 parts of south dodder seed, 10 parts of ainsliaea, 10 parts of corydalis tuber, 10 parts of peach kernel, 10 parts of common burreed rhizome and 10 parts of curcuma zedoary. The preparation method comprises the following steps of: preparing Chinese medicinal fine powder; preparing an extract; preparing a substrate material; preparing paste; and making a plaster. The bone fracture medicinal patch has the effects of relieving pain, stopping bleeding, diminishing swelling quickly and healing quickly, is free from harmful substances such as mercury, lead and the like, is nonirritant, is non-allergic to skin, does not pollute skin, is easy to strip, can be removed and stuck repeatedly, does not hurt hairs, and is mainly applied to patients with bone fractures and bone fracture injuries and whose tendons and bones are manually straightened or set, or people for which poroma is not formed a long time after bone fractures.