NOVELTY - Organic fertilizer comprises 100-300 pts. wt. poultry excrement, 100-150 pts. wt. banana stem stalk, 80-100 pts. wt. sodium alginate, 80-100 pts. wt. wormwood, 20-30 pts. wt. potassium nitrate, 20-50 pts. wt. zinc sulfate, 10-30 pts. wt. monocalcium phosphate, 10-30 pts. wt. calcium dihydrogen phosphate, 10-30 pts. wt. calcium nitrate, 20-30 pts. wt. magnesium sulfate, 4-5 pts. wt. microorganisms A, 4-5 pts. wt. microorganisms B and 5-10 pts. wt. charcoal. The microbial agent A include photosynthetic bacteria, yeast and Lactobacillus in a mixed ratio of 1:1-2:2-3.    USE - The organic fertilizer is useful for promoting banana plant growth, and preventing plant diseases and pests.    ADVANTAGE - The organic fertilizer can effectively improve soil compaction problems.    DETAILED DESCRIPTION - Organic fertilizer comprises 100-300 pts. wt. poultry excrement, 100-150 pts. wt. banana stem stalk, 80-100 pts. wt. sodium alginate, 80-100 pts. wt. wormwood, 20-30 pts. wt. potassium nitrate, 20-50 pts. wt. zinc sulfate, 10-30 pts. wt. monocalcium phosphate, 10-30 pts. wt. calcium dihydrogen phosphate, 10-30 pts. wt. calcium nitrate, 20-30 pts. wt. magnesium sulfate, 4-5 pts. wt. microorganisms A, 4-5 pts. wt. microorganisms B and 5-10 pts. wt. charcoal. The microbial agent A includes photosynthetic bacteria, yeast and Lactobacillus in a mixed ratio of 1:1-2:2-3. The microbial agent B includes solution of potassium bacteria, Bacillus licheniformis and Bacillus subtilis, in a mass ratio of 2:1-2:1-3. An INDEPENDENT CLAIM is also included for preparing organic fertilizer, comprising (i) drying poultry excrement at less than 30-50 degrees C condition for 1-3 days, simultaneously adding charcoal burning until turns red, retting poultry excrement on red-hot charcoal for 2-3 day, and bubbling oxygen on top; (ii) composting poultry excrement, sealing for first time for 12-24 hours, then adding microbial agent A, carrying out fermentation for 5-10 days under sealed conditions, to obtain fermented poultry excrement; and (iii) mixing banana stalks stem and fermented poultry excrement, puffing by adding into an extruder, to obtain puffed mixture, and then pulverizing to a powder, mixing with wormwood with 150-200 mesh puffed mixture, to obtain crude organic fertilizer; and (iv) mixing seaweed, potassium nitrate, zinc sulfate, calcium dihydrogen phosphate, calcium nitrate and magnesium sulfate, adding crude organic fertilizer with microbial agents B, carrying out aerobic fermentation for 5-10 days, drying, crushing, and granulating.