The invention relates to a compound fermentation type sun-cured red tobacco extract as well as a preparation method and applications of the compound fermentation type sun-cured red tobacco extract in electronic cigarettes, belonging to the technical field of tobacco perfumes. The invention further relates to the applications of the compound fermentation type sun-cured red tobacco extract in the electronic cigarettes. The compound fermentation type sun-cured red tobacco extract is applied to the electronic cigarettes as electronic cigarette tar, the smoke aroma concentration and richness can be obviously improved through atomization smoking, the brewing aroma and sweet aroma smell generated by fermentation are obtained, the sensory sucking quality is improved, and the compound fermentation type sun-cured red tobacco extract has the broad application prospect in the development of the flavor materials of electronic cigarette tar.