The invention provides electronic cigarette tar which comprises the following components by mass percentage: 90-99% of atomized liquid and 1-10% of coca cola essence, wherein the coca cola essence comprises the following components in parts by weight: 0.1-2 parts of alpha pinene, 0.1-2 parts of beta pinene, 1-30 parts of limonene, 1-10 parts of sweet orange oil, 1-20 parts of lemon oil, 0.1-0.5 parts of myrcene, 0.1-2 parts of cinnamic aldehyde, 0.1-5 parts of cinnamon oil, 0.1-10 parts of citral, 0.1-5 parts of geranial, 1-10 parts of geranyl acetate, 0.1-5 parts of sinensal, 1-10 parts of citronellol, 1-10 parts of geranyl propionate, 0.1-5 parts of eugenol allylguajacol, 0.1-2 parts of ethyl maltol, 0.1-3 parts of furanone, 0.1-5 parts of raspberry ketone, 1-25 parts of cinnamyl alcohol, 1-10 parts of cinnamyl acetate, 1-15 parts of vanillin, 1-15 parts of ethyl vanillin and 0.1-2 parts of coffee extract. The electronic cigarette tar with a coca cola taste is rich and plump in fragrance, and can achieve an effect similar to a pleasant feeling brought by drinking coca cola. The invention further provides a preparation method of the electronic cigarette tar. The method is simple and easy to operate, and is suitable for industrial production.