The invention discloses an external patch for treating injury of tendons and muscles. The external patch is prepared from 135-145 parts of pseudo-ginseng root, 120-130 parts of Chinese angelica, 80-90 parts of safflower, 120-130 parts of frankincense, 120-130 parts of myrrh, 80-90 parts of yellowmouth dutchmanspipe root, 120-130 parts of large-leaved gentian and 120-130 parts of common clubmoss herb. A preparation method of the external patch comprises the following steps of: adding the Chinese angelica, frankincense and myrrh into water for soaking, extracting volatile oil for later use, filtering decoction dregs and a residual liquid out, extracting a filtrate for later use, adding water into the decoction dregs and the safflower for decocting, filtering a decoction, combining filtrates, and concentrating under reduced pressure to obtain thick paste; adding ethanol into the pseudo-ginseng root, yellowmouth dutchmanspipe root, large-leaved gentian and common clubmoss herb for performing reflux extraction, combining filtrates, recovering ethanol, and concentrating into thick paste; combining the two types of paste, adding polyacrylate sodium, mixing uniformly to obtain rubber paste, and spreading onto a back lining film; and diluting the volatile oil with ethanol, spraying onto semi-finished paste, covering a lining, and slicing to obtain a finished product. The external patch has the effects of promoting blood circulation to remove blood stasis, soothing tendons, relieving pain, warming meridian, promote blood circulation, expelling wind, removing dampness, and relaxing and activating the tendons, has rich bulk pharmaceutical source and an advanced process, and contributes to mass production.