The inflammatory response of the cornea caused by various factors is collectively called keratitis. It is one of the common diseases in ophthalmology. The cornea is located at the front of the eye and is in direct contact with the outside world and is susceptible to inflammation due to damage from microorganisms, trauma and physical and chemical irritants. The clinical manifestations are blurred vision, pain, photophobia and lacrimation, and other irritating symptoms, as well as significant vision loss. Currently, keratitis is clinically classified as infectious, immune, dystrophic, neuroparalytic and exposure according to the causative agent. The treatment of keratitis is as follows: The basic principle in the treatment of keratitis is to take all effective measures to control the infection quickly, to strive for early cure, and to reduce the sequelae of keratitis to a minimum. Since most ulcerative keratitis is due to external causes, it is extremely important to remove the causative external causes and eliminate the causative microorganisms. In addition to ocular treatment, keratoconjunctival lesions associated with systemic diseases should be actively treated for the primary disease. Pay attention to observation during the treatment, if the conjunctival congestion is reduced, the corneal lesions shrink and flatten, indicating that the treatment is effective. If the conjunctival congestion is aggravated, the corneal lesion expands deeper and around, the pus accumulation in the anterior chamber is obvious, the surface condition deteriorates, and the treatment is ineffective, the treatment plan should be adjusted in time. If conservative treatment is ineffective or the ulcer leaves a scar that significantly affects vision, corneal transplantation should be performed.