The invention relates to a preparation method of
aquatic animal insect repellent, comprising the following implementation steps: (1) weighing the following bulk pharmaceutical chemicals in parts by weight: 200-500 parts of
artemisia apiacea, 100-200 parts of
antipyretic dichroa and 100-200 parts of granatum; (2) adding water according to the total amount ratio of the bulk pharmaceutical chemicals: 1: 8-12; soaking for 30min by hot water at the temperature of 45 DEG C; decocting according to the conventional method; decocting for 40min by
slow fire after boiling for the first time; filtering; decocting for 30min by
slow fire after the filter residue boils with 6 times of added water;
combing the filter liquor and filtering; concentrating the filter liquor at the temperature of 40-50 DEG C to the condition that the
relative density is 1.05; (3) adding
alcohol with weight concentration of 95%, leading the
alcohol content in final concentration to be 60%, stirring, and standing for 24h; (4) filtering, recovering the
alcohol; adding
distilled water solution, concentrating the water solution at the temperature of 40-50 DEG C to the condition that the
relative density to be 1.05-1.20; and (5) cooling the concentrated solution to
room temperature, and subpackaging into 250ml /
bottle. The preparation method is simple and effective,
insect expelling Chinese herbal
medicine is a
drug for preventing and curing parasites in the body or out of the body of the cultivating aquatic animals, is harmless and protects the environment, and has obvious preventing and curing effects.