The invention discloses an external spray for treating viral herpes and relates to a medicine. According to the technical scheme disclosed by the invention, 100cc of the external spray is prepared by the following steps: preparing 15-25mg of poly I-C, 40-60mg of chlorpheniramine, 1500-2800mg of acyclovir, 2,000-2800mg of lidocaine, 15-25mg of vitamin B12, 25-50mg of menthol, 200-300mg of chloramphenicol and the balance of ethanol; and bottling. The spray is used in a spraying manner. The viral herpes is clustered red hill herpes caused when viruses invade the skin or mucosa or superficial nerves; the viral herpes is distributed into a belt along the nerve positions sometimes, and therefore the group of cases are named herpes zoster; the elder and weak patients are serious in pain; some after pain symptoms last for several years; and the patients are painful. The invention aims at providing the external spray for treating viral herpes. The external spray is used for treating skin diseases such as viral herpes and has the effects of restraining viruses, relieving symptoms and shortening the course; and a new medical method is provided.