The present invention belongs to the field of traditional Chinese medicinal preparations and particularly relates to traditional Chinese medicinal jelly for treating recurrent oral ulcers and a preparation method thereof. The traditional Chinese medicinal jelly comprises main medicines and accessory materials. The main medicines are characterized by comprising the following ingredients in parts by weight: 30-40 parts of burdock roots, 15-30 parts of yacon leaves, 10-20 parts of haws, 1-3 parts of chrysanthemums, 1-2 parts of fructus gardeniae, 1-2 parts of mints, 1-3 parts of honeysuckles, 1-3 parts of dandelions, 1-3 parts of fructus momordicae, 1-3 parts of semen sterculiae lychnophorae, 1-3 parts of licorice, 1-3 parts of radix platycodonis, 1-3 parts of red dates and 1-3 parts of poria cocos. The accessory materials comprise 2-4 parts of a thickening agent, 10-20 parts of a sweetener, 1-5 parts of an acidity adjusting agent and 1-3 parts of a preservative. The traditional Chinese medicinal jelly can quickly and effectively treat the recurrent oral ulcers, is less affected by saliva and more easily accepted by users, and improves taking compliance of patients, especially children patients.