Flue-cured tobacco grade structure adjusting method

The invention discloses a flue-cured tobacco grade structure adjusting method. The method thoroughly solves the contradiction between current tobacco market demands and the natural growth law of tobacco plants. The production mode of multifoliate flue-cured tobacco varieties is adopted, at the stage when 50% tobacco plants in the whole land bloom, 6-8 pieces of inapplicable fresh tobacco leaves are removed from bottom leaves and lower leaves; after middle leaves are harvested, secondary topping is performed on the tobacco plants, wherein during secondary topping, 3-4 pieces of tobacco leaves, of which the upper characteristics are obvious, of the uppermost part of each tobacco plant are removed, and the total number of effective leaves of each tobacco plant reaches 14-17. After the treatment method is performed, the lower tobacco leaves can be controlled within 5%, the upper tobacco leaves can be controlled within 8%, and the middle tobacco leaves can be increased to 87% or more. Accordingly, the purpose of 100% superior middle tobacco leaves and 70% superior tobacco leaves for all produced tobacco leaves can be achieved.