The invention discloses a flue-cured tobacco planting method for improving tobacco leaf quality by using sweet ocimum basilicum. The sweet ocimum basilicum and the flue-cured tobacco are inter-planted, and a single flue-cured tobacco planting mode is changed to form a one-plus-one planting mode that a row of flue-cured tobaccos and a row of sweet ocimum basilicum are interplanted. An application effect shows that the flue-cured tobacco which grows in the interplanting mode is obviously superior to monocultured flue-cured tobacco in data of plant height, steam diameter, leaf area, effective leaf number, single leaf weight and single plant yield. A specific aroma component of elemene of the sweet ocimum basilicum is detected in the fresh interplanted flue-cured tobacco leaves, and related components are not detected in the monocultured cigarette. Through sensory evaluation, the sensory quality of the interplanted flue-cured tobacco is superior to that of the monocultured flue-cured tobacco. Thus, the quality of the flue-cured tobacco can be effectively improved by applying the flue-cured tobacco planting method; and meanwhile, a higher ornamental value is realized by using interplanting of the aromatic crop and the flue-cured tobacco.