The invention discloses a cave and strip combined fertilizing method used for a flue-cured tobacco base fertilizer. Cave fertilizing holes are arranged along a radial direction on a tobacco ridge after a tobacco land is ridged; then stripe fertilizing furrows are arranged among adjacent cave fertilizing holes; tobacco dedicated basal fertilizer is applied in the cave fertilizing holes and the strip fertilizing furrows, wherein the total weight of the tobacco dedicated basal fertilizer in the cave fertilizing holes accounts for 30-40% of that of the tobacco dedicated basal fertilizer; farmyard manure is applied in the cave fertilizing holes before the tobacco dedicated basal fertilizer is applied; the total weight of the strip fertilizer accounts for 60-70% of that of the tobacco dedicated basal fertilizer, and finally the strip fertilizing furrows after being applied with the fertilizer are wrapped with soil. Through the arrangement of cave fertilizing holes and strip fertilizing furrows and match of the fertilizing amount of cave fertilizing and strip fertilizing, the cave and strip combined fertilizing method used for the flue-cured tobacco base fertilizer has the advantages that utilization rate of fertilizer is effectively improved, fertilizing labor is reduced, normal growth of tobacco plants is boosted, tobacco leaf yield quality is improved, thus economic benefit is improved.