The invention discloses pure natural essence oil mosquito-repellent liquid and a preparation method thereof .The mosquito-repellent liquid is prepared from, by volume, 10-20 parts of pelargonium hortorum essence oil, 5-10 parts of lavender essence oil, 10-20 parts of citronella essence oil, 1-5 parts of chamomile essence oil, 10-20 parts of sorbitan quatraoleate and 40-60 parts of deionized water .The mosquito-repellent liquid has the advantages of being wide in adaptability, obvious in effect, free of irritation, free of chemical reagent addition, safe, efficient and the like, is particularly suitable for pregnant women, babies and people with sensitive skin to use, can solve the problems that sanitary pesticide components such as deet and insectifuge ester are used in existing mosquito-repellent toilet water and are irritative and allergic to skin, and can solve the problems that traditional toilet water contains high-concentration ethyl alcohol, accordingly skin moisture loss, ageing and wrinkles are caused, and some safety hidden hazards can be caused.