The invention relates to external oculentum for treating amblyopia, astigmatism, strabismus, myopia and visual fatigue of teenagers and a preparation method thereof. The oculentum comprises the following components: 20 to 40 parts of feather cockscomb seed, 20 to 40 parts of flower of small pipewort, 20 to 50 parts of raspberry, 30 to 60 parts of cassia seed, 25 to 50 parts of medlar, 30 to 60 parts of pale butterflybush flower, 20 to 40 parts of saffron, 20 to 40 parts of wild chrysanthemum, 30 to 50 parts of danshen root, 30 to 50 parts of largetrifoliolious bugbane rhizome, 20 to 40 parts of mint, 20 to 40 parts of storax, 30 to 50 parts of calamine, 2,000 to 3,000 parts of Vaseline, 300 to 500 parts of liquid paraffin and appropriate amount of water. The external oculentum is prepared by removing impurities from the medicinal raw materials; decocting, filtering and concentrating the medicinal raw materials; and adding the Vaseline and the liquid paraffin. The external oculentum is scientifically prepared according to compatible principle of monarch, minister, assistant and guide of Chinese medicinal theory. The external oculentum can effectively treat the amblyopia, the astigmatism, the strabismus, the myopia, the visual fatigue and ametropia of the teenagers, and has the advantages of exact curative effect and no toxic or side effects on human bodies.