The invention discloses a medicine bath bag for tendon injury and cold-dampness. The medicine bath bag comprises the following raw materials by weight percentage: 8% of selaginella tamariscina, 8% oflycopodium clavatum, 10% of drynaria rhizomes, 6% of zanthoxylum bungeanum, 8% of folium artemisiae argyi, 8% of acorus tatarinowii, 8% of zanthoxylum nitidum, 6% of peach kernel, 6% of safflower, 9%of caulis impatientis, 6% of sappanwood, 7% of ajuga herb, and 10% of sweetgum fruits. After long-term clinical trials and multiple amendments to the formulation components of the inventors, the medicine bath bag can play the role of warming, dispersing cold, opening pores to release sweat, clearing channels and collaterals, activating fluid and generating muscle, with the cooperation of drynariarhizomes, zanthoxylum nitidum, caulis impatientis and lycopodium clavatum, has the effects of dispelling wind-dampness, unblocking channels and collaterals and detoxifying, and has a significant effect on the treatment of rheumatic paralysis and muscle and bone pain, the pain caused by rheumatism, tendon injury, cold-dampness arthralgia of shoulder, neck and waist, etc. can be effectively relieved, sleep quality is improved, and human immunity is enhanced. In addition, the natural traditional Chinese medicine is selected in the formula of the invention, and has no toxic and side effects, and the medicine bath bag can be applied in medicine bath or steamed with suitable temperature for external application.