The invention discloses a traditional Chinese medicine for treating central retinal vein obstruction. The traditional Chinese medicine is characterized by being prepared from the following medicinal materials in parts by weight: 8-10 parts of peach seeds, 8-10 parts of safflower, 12-15 parts of angelica, 12-15 parts of rehmannia root, 8-10 parts of Szechuan lovage rhizome, 8-10 parts of red peony root, 5-6 parts of Chinese thorowax root, 8-10 parts of achyranthes root, 8-10 parts of horse-tail club moss, 5-6 parts of platycodon grandiflorum, 2-3 parts of licorice, 12-15 parts of Chinese arborvitae twigs, 8-10 parts of motherwort fruits, 0-30 parts of clematis finetiana and 0-9 parts of straight-flowered corydalis. A preparation method comprises the steps of weighing the medicinal materials, putting the medicinal materials into a container, adding water of which the quantity is 8 times that of the medicinal materials, decocting for 1.5 hours, and filtering; adding water of which the quantity is 6 times that of filter residues into the filter residues, decocting for 1 hour, and filtering; and combining the filtrates, concentrating, drying, and filling capsule shells with the dried mixture. Clinical experiments prove that the traditional Chinese medicine achieves a significant effect of treating the central retinal vein obstruction by selecting the appropriate medicinal materials and the ratio thereof, is safe and does not have toxic or side effect.