NOVELTY - Biological charcoal fertilizer comprises 37-43 pts. wt. corn core particles, 22-26 pts. wt. traditional Chinese medicine slag, 3-5 pts. wt. sodium nitrate, 2-4 pts. wt. sodium chloride, 3-4 pts. wt. calcium bicarbonate, 28-32 pts. wt. soybean pod shell powder, 2-3 pts. wt. disodium EDTA, 110-130 pts. wt. fresh Enteromorpha, 4-5 pts. wt. composite microbial inoculant, 190-210 pts. wt. wheat straw, 24-28 pts. wt. fresh urine, and balance water. The composite microbial inoculant comprises Rhizopus oryzae, Bacillus subtilis and Bacillus cereus at ratio of 1:2:2.    USE - Biological charcoal fertilizer used for increasing crop yield (claimed).    ADVANTAGE - The fertilizer is rich in nutrients and microbes, increases carbon dioxide concentration in the vicinity of crop, and promotes photosynthesis of crop.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of fertilizer comprising taking fresh Enteromorpha, washing, crushing, adding corn core particles, traditional Chinese medicine slag and bean pod shell powder, mixing with water, adding into fermentation tank, adjusting water content to 55-65%, inoculating with composite microbial inoculant, stirring, fermenting, turning once every 3-4 days, fermenting at 70 degrees C for 25-29 days, maturing, and pressing using filter press to obtain fermentation liquid and residue; crushing wheat straw, adding into carbonization kiln, carbonizing at 530-630 degrees C for 2-3 hours, re-carbonizing at 800-900 degrees C for 1-2 hours, and cooling to room temperature; mixing fermentation liquid, disodium EDTA and sodium nitrate, heating to 55-65 degrees C for 50-70 minutes, adding sodium chloride, mixing, cooling to room temperature, adding calcium bicarbonate, and stirring to obtain nutrient solution; mixing with fresh urine, adding citric acid solution to adjust pH at 3.5-4.5, heating, concentrating into 8-12 times, dividing into three, mixing with second step product, repeatedly absorbing, and drying; and mixing with resulting fermentation residue and remaining raw materials, putting into granulator, granulating, weighing, packaging, and storing.