NOVELTY - Wheat straw biochar fertilizer comprises 22-26 pts. semen citri reticulatae powder, 3-4 pts. boric acid, 4-6 pts. sodium bicarbonate, 33-37 pts. soybean meal, 35-39 pts. broken bone powder, 12-16 pts. maple syrup, 2-3 pts. silicon sulfate, 110-130 pts. fresh Enteromorpha, 5-6 pts. complex microbial inoculum, 245-255 pts. wheat straw, 26-30 pts. fresh urine and proper amount of water, where the complex microbial inoculum comprises Rhizopus oryzae, Bacillus subtilis and Bacillus cereus in a ratio of 1:2:2.    USE - The wheat straw biochar fertilizer is useful for sandy soil texture (claimed).    ADVANTAGE - The fertilizer buffers the soil temperature by reducing the temperature difference between day and night, ensures the late crop nutrient requirements and simultaneously ensures strong permeability of sand, is added with microorganisms to increase aerobic activity, promotes the decomposition of organic matter in fertilizer thus increasing the fertilizer utilization and increased soil fertility.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing biochar fertilizer, comprising: (i) washing and crushing fresh Enteromorpha, then mixing with semen citri reticulatae powder, soybean meal and broken bone powder, adding water to adjust moisture content to 40-50%, passing into a fermentation tank, inoculating complex microbial inoculum, stirring and carrying out fermentation by turning once for every 3-4 days, simultaneously measuring the fermentation stack temperature, controlling the fermentation stack maximum temperature to less than 70 degrees C, fermenting for 20-23 days, subjecting to filter press to obtain broth and ferment residue; (ii) crushing the wheat straw and adding into a kiln, carrying out carbonization at 420-480 degrees C for 1-3 hours, raising its temperature to 830-870 degrees C for 1-2 hours, carrying out second carbonization, stopping heating, then cooling the resultant wheat straw carbon powder to room temperature before use; (iii) adding maple syrup and silicon sulfate into the resultant fermentation broth, heating to 55-60 degrees C for 30-50 minutes, cooling to room temperature, then adding boric acid and sodium bicarbonate, stirring and adding nutrient solution; (iv) uniformly mixing the fresh urine with the resultant nutrient solution, adjusting its pH to 3.8-4.2 using citric acid solution, heating the mixture and concentrating to 10-11 folds, mixing with wheat straw carbon powder for adsorption, then drying the mixture; and (v) mixing the resultant ferment residue, material of step (iv) and remaining raw materials, granulating via granulator, weighing the resultant particles and packaging.