The invention provides a specialized organic/inorganic composite biological medicine fertilizer for corn, and a preparation method thereof. The weight parts of composition raw materials are as follows: 60-70 parts of corn straws, 15-20 parts of fruit residues, 3-5 parts of shrimp chaff, 10-15 parts of earthworm cast, 15-20 parts of potassium humate, 15-20 parts of cottonseed cakes, 10-12 parts of duck feather, 20-23 parts of sepiolite, 15-17 parts of urea, 12-14 parts of calcium superphosphate, 14-16 parts of calcium nitrate, 10-12 parts of potassium sulfate, 5-7 parts of areca-nut, 4-6 parts of pepper, 4-6 parts of coptidis rhizome, 4-6 parts of celastrus orbiculatus, 0.05-0.1 part of ammonium molybdate, 1.5-2.0 parts of copper sulfate, 0.7-1.0 part of manganese sulfate, 2-4 parts of ferrous sulfate, 2-3 parts of castor oil, 3-4 parts of EM strains and 3-5 parts of cinnamon oil. A green organic fertilizer is obtained by mixing a plurality of organic wastes and fermenting the mixture, thereby reducing environment pollutions. The specialized organic/inorganic composite biological medicine fertilizer for the corn has the advantages of comprehensive nutrition and enhanced sterilizing effects by mixing the fermented organic materials and inorganic fertilizer and adding medicine juice of the Chinese herbal medicine having insectidical functions. With the application of the fertilizer, corn quality can be effectively increased; and the corn has green leaves, white flower, prolonged flowering period and increased output.