The invention provides external insecticide drop with natural plant essential oil for pets, a method for preparing the external insecticide drop and application thereof. The external insecticide drop, the method and the application have the advantages that the natural plant essential is used as a skin penetration enhancer, accordingly, the odor of the external insecticide drop can be effectively improved while the action time of the external insecticide drop can be prolonged, and the service comfort can be enhanced; parasites can be expelled and killed by the external insecticide drop, and accordingly the external insecticide drop can be used for killing internal and external parasites for the pets; components are further mixed with one another to prepare the external insecticide drop by the aid of the method, the method is simple and is high in efficiency, good effects can be realized by the external insecticide drop prepared by the aid of the method, the external insecticide drop is high in service comfort, and the like.