Severe allergic conjunctivitis does not usually heal on its own, and should be treated promptly by removing the allergen and applying antihistamines and glucocorticoids to avoid complications. Allergic conjunctivitis will lead to eye itching, foreign body sensation, increased conjunctival secretion, etc. In severe cases, it will cause visual impairment and corneal infection, and it will not be cured on its own, so it should be treated promptly. Severe allergic conjunctivitis, should be detached from the allergen, is also the most ideal and effective means of treatment; can use some topical antihistamines, such as levocabastine hydrochloride eye drops, emetine eye drops, etc.; can also be oral antihistamines, such as benadryl, loratadine, etc.; can also be used in some of the glucocorticosteroid eye drops, such as betamethasone, dexamethasone. Severe allergic conjunctivitis should be treated under the guidance of a doctor to avoid private abuse of drugs to avoid adverse reactions.