The invention discloses a 
medicine for treating 
canker sore. The 
medicine is prepared from the following raw materials in parts by weight: 8 to 16 parts of herba menthae, 10 to 20 parts of waternut 
corm powder, 4 to 15 parts of 
powder on the surface of a dried persimmon, 4 to 15 parts of rhizoma cimicifugae, 4 to 15 parts of liquorice root, 8 to 16 parts of 
radix ophiopogonis, 5 to 15 parts of radix sophorae tonkinensis, 10 to 20 parts of herba taraxaci, 8 to 16 parts of 
herb of 
bidens bipinnata, 4 to 16 parts of ramulus cinnamomi, 8 to 16 parts of fructus tsaoko, 5 to 15 parts of herba euphorbiae humifusae, 8 to 16 parts of fructus aurantii, 8 to 16 parts of caulis bambusae in taeniam, 6 to 12 parts of radix saposhnikoviae, 3 to 9 parts of herba schizonepetae, 8 to 16 parts of 
rhizoma coptidis, 10 to 20 parts of 
indigo naturalis and 5 to 15 parts of fructus toonae sinensis. In the 
medicine disclosed by the invention, all added components work together, and the effects of strengtheningthe physique, clearing heat, detoxifying, regulating qi, invigorating 
blood circulation, calming the nerves, arresting 
convulsion, clearing liver, improving vision, promoting tissue regeneration andthe like are obtained; the medicine is prepared by adopting pure natural traditional Chinese medicines, has the effect of treating both symptoms and root causes of the 
canker sore, and has the advantages that the 
canker sore can be quickly healed, no medicine 
side effect exists, the 
canker sore is difficult to recur after being healed and the like.