The invention discloses a method for developing a novel indoor acaricide. The novel acaricide uses clove and other Chinese medicinal materials as raw materials, the main active component thereof is eugenic acid, and the novel acaricide is a pure natural chemical substance, has no notable harms to human bodies and other organic bodies, has no potential hazards to the environment too, and can be widely applied to killing, preventing and controlling various dust mites of dermatophagoides pteronyssinus, dermatophagoides farinae and the like in various regions and various indoor environments. The novel acaricide can effectively control the number of the dust mites in the living environments of people, greatly reduce the density of dust mite allergens in the indoor environments, and significantly reduce the disease incidence of dust mite anaphylactic diseases. Besides, the novel acaricide has outstanding effects of preventing and performing adjuvant therapy on various anaphylactic diseases taking the dust mites as the allergens, such as allelgic asthma, rhinitis and the like.