NOVELTY - Bauxite tailings carbonized soil is stirred and squeezed to obtain irregular tabular grains. Irregular tabular grains are carbonized, to obtain semi-finished product. The semi-finished product is combusted, quickly extinguished and charred, to obtain carbonized semi-finished product. Carbonized semi-finished product is stirred and extruded in granulator, to obtain semi-finished nutritive soil particles. Semi-finished nutritive soil particles are low-temperature sterilized and dried, to obtain sterilized and dried bauxite tailings charred nutrient soil.    USE - Production of nutrient soil used for planting flowers and seedlings.    ADVANTAGE - The method enables production of odorless, nontoxic and sterile nutrient soil with high fertilizing characteristics and quality, and excellent water retention property.    DETAILED DESCRIPTION - Bauxite tailings carbonized soil is added to mixer, stirred, conveyed to roll machine and squeezed to obtain irregular tabular grains with thickness of 8 mm or less. Irregular tabular grains are transported to rotary furnace and carbonized at 250-450 degrees C for 30-90 minutes, to obtain semi-finished product. Semi-finished product is provided to high-pressure water spray nozzle in rotary carbonization furnace. The semi-finished product is combusted, quickly extinguished and charred, to obtain carbonized semi-finished product with water content of 25% or less. Carbonized semi-finished product is added to mixer, stirred and extruded in granulator, to obtain semi-finished nutritive soil particles with particle diameter of 6-12 mm and particle length of 6-20 mm. Semi-finished nutritive soil particles are transported to rotary sterilization oven, low-temperature sterilized and dried at 60-100 degrees C for 30-90 minutes, to obtain sterilized and dried bauxite tailings charred nutrient soil with moisture content of 20% or less. The bauxite tailings charred nutrient soil is cooled. The carbonized semi-finished product contains 15-35 wt.% bauxite tailings, 10-30 wt.% waste activated clay, 5-25 wt.% peat, 5-20 wt.% attapulgite, 0-15 wt.% bentonite, 0-15 wt.% zeolite, 5-15 wt.% crushed waste, 0.5-5 wt.% vermiculite and 5-45 wt.% water. The bauxite tailings charred nutrient soil contains 45-75 wt.% bauxite tailings charring soil, 5-25 wt.% wastewater retting agent, 0.2-10 wt.% diammonium phosphate, 0.5-5 wt.% expanded perlite, 0.1-5 wt.% superabsorbent, 0-3 wt.% ferrous sulfate and 0-35 wt.% water. The wastewater retting agent contains 35-75 wt.% crushed waste and 25-65 wt.% water. The wastewater retting agent is prepared by pulverizing waste, adding waste to soaking pool, adding water, grinding and smoothing waste, immersing crushed waste in water, and retting crushed wastewater for 10-30 days.