The present invention relates to a medicinal plaster for treating back pain, wherein the medicinal plaster comprises: 10-20 parts by weight of Epimedium; Casualty (Fructus Cnidii) 10-20 parts by weight; Thread fern (Lygodium japonicum) 15-20 parts by weight; Fermented Soybean (Fermented Soybean) 10-15 parts by weight; Mint oil (mint oil) 2-4 parts by weight; contains as a raw material.본 발명은 허리 통증을 치료하기 위한 약용 플라스터에 관한 것으로, 상기 약용 플라스터는, 에피 메듐(Epimedium) 10-20중량부; 사상자(Fructus Cnidii) 10-20중량부; 실고사리(Lygodium japonicum) 15-20중량부; 발효 콩(Fermented Soybean) 10-15중량부; 민트 오일(mint oil) 2-4중량부;를 원료로 포함한다.