The invention discloses Chinese medicinal magneto-therapy externally applied plaster applied to acupuncture points and used for treating asthma. The externally applied plaster comprises the following components in part by weight: 10 to 30 parts of white mustard seed, 10 to 30 parts of corydalis tuber, 10 to 20 parts of euphorbia kansui, 10 to 20 parts of roasted asarum, 5 to 15 parts of roasted ephedra, 5 to 15 parts of unprocessed pinellia tuber, 5 to 10 parts of roasted liquorice, 10 to 20 parts of roasted sessile stemona root, 5 to 10 parts of cinnamon, 5 to 10 parts of semen lepidii, 60 to 80 parts of ginger juice, 10 to 15 parts of roasted gleditsia sinensis, 1 to 1.5 parts of musk, 10 to 15 parts of arisaema cum bile, 10 to 20 parts of fritillaria, 10 to 20 parts of earthworm, 1 to 5 parts of borneol, 10 to 20 parts of bitter almond, 10 to 20 parts of swallowwort rhizome, and 10 to 20 parts of roasted common coltsfoot flower. The externally applied plaster is characterized by consisting of a flaky sticking matrix, a magnetic block and Chinese medicinal ointment sequentially from inside to outside. The externally applied plaster has the characteristics of scientific compatibility of Chinese medicaments, reasonable content of each component, simplicity in preparation method, safety and convenience in use, definite and obvious curative effect and the like. By matching acupuncture point application, the effective rate of the externally applied plaster for treating the asthma reaches 90 percent.