NOVELTY - An organic-inorganic composite fertilizer comprises (wt.%) rotten straw (40-60), rotten tobacco waste material (10-25), cake fertilizer (5-10), amino acid (0.03-0.1), potassium nitrate (1-5), potassium sulfate (8-14), ammonium dihydrogen phosphate (1.5-2.5), ammonium bicarbonate (1-2.5), urea (0.05-0.35), phosphate fertilizer (3-8), ammonium molybdate (0.01-0.07), borax or boric acid (0.05-0.5), zinc sulfate (0.5-1.5), and magnesium sulfate (0.5-1.5).    USE - Organic-inorganic composite fertilizer used for promoting growth of tobacco seedling (claimed).    ADVANTAGE - The fertilizer improves physicochemical properties of soil, nutrient equilibrium absorption ability and utilization rate of fertilizer, disease resistance and drought resistance capability of the tobacco, and quality of tobacco leaf. Further, the fertilizer utilizes waste straws and tobacco waste materials so that wastes are turned into valuable materials.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the organic-inorganic composite fertilizer, comprising:    (A) adjusting water content of rotten straw and rotten tobacco waste material to 38-42%, sterilizing for 10-15 minutes at high temperature of 250 degrees C, and then adjusting water content to 20-22%;    (B) crushing the rotten straw and the rotten tobacco waste material, sieving crushed material through 1 mm and 2 mm sieves respectively, sieving crushed material of more than 2 mm again to obtain 70-75% of material having particle size of 1 mm, then mixing crushed rotten straw and rotten tobacco waste material to obtain mixed rotten raw material;    (C) dissolving amino acid, ammonium molybdate, urea, zinc sulfate and magnesium sulfate in water to obtain mixed solution, uniformly spraying the mixed solution onto the mixed rotten raw material, drying the mixed material in air naturally to water content of less than 25%; and    (D) uniformly mixing other raw materials with the mixed material, adjusting water content according to product requirement, and pelletizing to obtain fertilizer with diameter of less than 5 mm.