The invention relates to the technical field of cigarette flavors, in particular to a malt coke-sweet flavor prepared from coked malt and application thereof in electronic cigarettes. A preparation method includes: a, pretreating raw materials; b, extracting; c, dewaxing; d, performing membrane separation. The malt coke-sweet flavor has rich compounds such as pyrazine compounds, furan compounds, furanone compounds, pyrone compounds and cyclopentenone compounds, can impart pleasant coke-sweet aroma to electronic cigarettes, and is more satisfactory to domestic tobacco lovers as the aroma and the intrinsic smell of tobacco are harmonious; coke-sweet ingredients in the coked malt are extracted, separated and enriched specifically, ingredients, contained in malt extract and adverse to electronic cigarette smoking taste, such as plant wax, proteins, starch and polysaccharides are removed effectively, and the solubility of the malt extract in propylene glycol and glycerol are improved. The preparation process is simple and easy to operate, low in raw material price, economic and environmentally friendly in production, and applicable to large-scale industrial production.