The invention discloses an eggplant extract solution and application thereof to cigarettes. The eggplant extract solution includes an eggplant fruit extract and an eggplant plant extract; the eggplantfruit extract is extracted and acquired by soaking eggplant fruits in an extracting solution at the temperature of 70-90 DEG C; the eggplant plant extract is acquired by successively performing drying, cutting up, enzymolysis, ultrasonic extraction, filtering, pressure reduction and concentration on roots, stems, and leaves of eggplant plants. The eggplant extract solution can be applied to cigarettes as a cigarette humectant and an accelerator, and the moisture-retention effect of the conventional humectants can be significantly improved. Eggplant is a vegetable, the extract of the eggplantis poisonless and harmless to a human body, another harmful ingredients will not generated for smokers while the extract of the eggplant is added into the cigarettes; and the eggplant extract solutionis wide in application prospect.