The invention relates to tobacco tar and a preparation method thereof, and belongs to the technical field of tobacco leaf processing. The tobacco tar is extracted from tobacco plants and takes nicotine and neophytadiene as main components; the tobacco tar extraction method comprises three main steps of extraction by a Soxhlet extractor, simultaneous distillation extraction and evaporation, whereina extracting agent used in the method is dichloromethane; and according to the tobacco bar, by combining Soxhlet extraction and simultaneous distillation extraction and using dichloromethane as the extracting agent, the extracted tobacco tar components mainly comprise nicotine and neophytadiene, and the components are single, so that the influence of other impurities on the quality of cigarettesis effectively avoided.