NOVELTY - Organic fertilizer and its preparation method are claimed. The organic fertilizer contains farmyard manure, topsoil, sintered kaolin, urea, sawdust, organic enzyme and spring water. The method for preparing organic fertilizer involves (a) mixing e.g. farmyard manure and organic enzyme, adding urea, and sticky rice bran and stirring mixture, (b) placing stirred raw materials into fermentation pool, sealing fermentation pool, and fermenting, (c) stirring fermented raw materials, drying, adding e.g. topsoil, stirring and granulating.    USE - The organic fertilizer is useful for tomato (claimed).    ADVANTAGE - The organic fertilizer is simple to prepare, cost-effective, rich in nutrients, reduces improper fertilization caused by change in gene quality and improves the quality of tomato.    DETAILED DESCRIPTION - Organic fertilizer and its preparation method are claimed. The organic fertilizer comprises 50 pts. wt. farmyard manure, 15 pts. wt. topsoil, 5 pts. wt. sintered kaolin, 10 pts. wt. urea, 12 pts. wt. rice husk, 5 pts. wt. sawdust, 2 pts. wt. effective microorganism (EM) fungus, 2 pts. wt. organic enzyme, 3 pts. wt. molasses fermented liquid, 2 pts. wt. seaweed powder, 2 pts. wt. green tea residue, 5 pts. wt. sticky rice bran, and 20 pts. wt. spring water. The method for preparing organic fertilizer involves (a) uniformly mixing farmyard manure, organic enzyme, molasses fermented liquid, EM fungus and spring water, adding urea, rice husk, sawdust, seaweed powder, green tea residue and sticky rice bran, and uniformly stirring the mixture, (b) placing the stirred raw materials into fermentation pool, sealing the fermentation pool, fermenting the mixture at 28-25 degrees C for 100 days, where the mixture is fermented at early stage for 30 days, middle stage for 40 days, and later stage for 30 days under closed condition to avoid easy corruption of raw materials, and fermentation during the middle stage fermentation is performed once at 28-32 degrees C for 15 days, and late fermentation is performed until bright color change is observed, and dispersing the organic fertilizer, (c) uniformly stirring the fermented raw materials, drying the stirred raw materials by airing, adding sintered kaolin, and topsoil, uniformly stirring and scattering the raw materials, and granulating the scattered raw materials. The organic enzyme is obtained by (a) weighing 10 kg soybean, 0.5 kg glutinous rice flour, 0.2 kg papaya proteinase, 0.3 kg selenium, 0.2 kg purple sweet potato anthocyanin, 0.06 kg potassium sorbate, and 0.1 kg omega -3 polyunsaturated fatty acid, (b) soaking soybean in 0.2% potassium hydroxide solution for 30-35 hours, and centrifuging the soaked soybean into solid material to obtain soybean pulp, (c) crushing soybean pulp obtained in step (b) using ultrasonic disintegrator to obtain soybean pulp powder dissolving glutinous rice flour, papaya proteinase, selenium, purple sweet potato anthocyanin, omega -3 polyunsaturated fatty acid and potassium sorbate in 35-50 degrees C water, adding soybean pulp powder and into the solution, and fermenting the mixture for 80-120 hours, (d) indirectly steam heating the mixture at 90-110 degrees C in fermentation tank, and performing enzymolysis, and (e) spray drying the processed mixture into powder at high temperature, concentrating the dried powder, and packing the organic enzyme product.