The invention discloses a chloramphenicol eye ophthalmic gel and a preparation method thereof; every 1000ml of the chloramphenicol eye ophthalmic gel contains 5-50g of chloramphenicol, 0.05-1g of preservative, 1.0-7.5g of osmoregulation agent, 30-150g of gel stroma, and rest amount of acid-base buffering agent and water used for injection. Due to the optimization and technique improvement of the auxiliary materials, the medicine dosage forms of the chloramphenicol are enriched, detention time of the medicine in the eyes are greatly prolonged, and the medicine can exert the drug effect, thus not only improving healing efficacy, but also reducing the times and days for taking medicine, decreasing the part side effect of the medicine and the untoward effect caused by the whole body absorption, as well as having no pessimal stimulation response.