The invention discloses a melon essence and a preparation method thereof. The melon essence comprises the following raw materials: ethyl acetate, isobutyl acetate, benzyl acetate, methyl acetate, 2-methyl-butyl acetate, propyl acetate, butyl acetate, isopropyl acetate, 2-methyl butyrate, methyl butyrate, n-hexyl alcohol, ethyl propionate, methyl octanoate, hexyl acetate, acetaldehyde, acetic acid,ethyl butyrate, 2-methyl butanol, n-hexanal, isovaleraldehyde, benzaldehyde, leaf alcohol, methyl hexanoate, n-pentanol, benzyl alcohol, 2-methyl butyraldehyde, 2,6-nonadienol, amyl acetate, butyraldehyde, leaf acetate, cis-6-nonenal, isobutyl alcohol, methyl benzoate, 2-octanone, trans-2-hexenal, and cis-6-nonene-1-ol. The preparation method of the melon essence comprises a step of mixing all the raw materials. The melon essence prepared by the preparation method is mellow and full in aroma, and strong in sense of nature. Being added as a food additive into foods, including beverages, jams,pastries and the like, the melon essence is capable of endowing the foods with natural aroma and taste of Minqin honeydew melons.