NOVELTY - A plant root growth wheat straw biological coal fertilizer comprises 40-50 pts. wt. buckwheat shell, 25-30 pts. wt. biogas liquid, 13-16 pts. wt. diatomite, 10-14 pts. wt. ammonium nitrate, 5-7 pts. wt. potassium chloride, 28-32 pts. wt. turnip slag, 1-2 pts. wt. nickel sulfate, 110-120 pts. wt. fresh Enteromorpha, 5-7 pts. wt. composite microorganism inoculant, 200-220 pts. wt. wheat straw, and 18-20 pts. wt. fresh urine. The composite microorganism inoculant comprises rhizopus oryzae, Bacillus subtilis and Bacillus cereus at ratio of 1:2:2.    USE - Plant root growth wheat straw biological coal fertilizer.    ADVANTAGE - The fertilizer improves soil permeability, strengthens absorptive capacity of root of crops, improves rhizosphere growth environment which promotes growth of root, and has improved wheat biological coal quantity and diversity which enhances its activity.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of fertilizer comprising (A) washing fresh Enteromorpha, crushing, adding buckwheat shell, turnip slag and diatomite, mixing, adding water, loading into fermentation tank, adjusting water content to 55-65%, adding composite microorganism inoculant, stirring to carry out fermentation, turning once every 2-4 days while controlling fermentation maximum temperature to not greater than 70 degrees C for 3-4 weeks, and filter pressing to obtain fermentation broth and fermentation residue; (B) crushing wheat straw, adding into carbonization kiln, heating to 400-500 degrees C to carry out carbonization for 3-4 hours, increasing temperature to 750-850 degrees C for 1-2 hours to obtain wheat straw coal, taking out, and cooling to room temperature; (C) adding fermentation broth with biogas liquid and nickel sulfate, heating to 50-60 degrees C for 40-60 minutes, cooling to room temperature, adding ammonium nitrate and potassium chloride, and stirring to obtain nutrient solution; (D) mixing with fresh urine, adding citric acid solution to adjust pH to 3.8-4.2, heating, concentrating, adding wheat straw coal to carry out adsorption, and drying; and (E) adding fermentation residue and remaining raw materials, mixing, granulating, weighing, and packaging.