NOVELTY - Method for preparing carbonized nutritional soil, involves (a) adding composition containing maifanite tailings to mixer, mixing the composition containing maifanite tailings, and uniformly stirring obtained mixture using stirrer, (b) subjecting the mixture to carbonization, (c) passing carbonized tailings through high-pressure water spray nozzles to obtain semi-finished product, (d) adding the semi-finished product to granulator to obtain granules, (e) subjecting the granules to sterilization, and (f) drying, cooling and packaging product.    USE - The method is useful for preparing carbonized nutritional soil (claimed) which is used as nutritional matrix for planting flowering plants.    ADVANTAGE - The method prepares carbonized nutritional soil having good quality and water-retaining property. The carbonized nutritional soil is nontoxic, harmless and rich in nutritional components including nitrogen, phosphorus, potassium, organic matter and microelement, and has no peculiar smell.    DETAILED DESCRIPTION - Method for preparing carbonized nutritional soil, involves (a) adding composition containing maifanite tailings to mixer, mixing the composition containing maifanite tailings, and uniformly stirring obtained mixture using stirrer to obtain mixture having particle size of less than or equal to 8 mm, (b) subjecting the mixture to carbonization using rotary carbonizing furnace at 250-450 degrees C for 30-90 minutes, (c) passing carbonized tailings through high-pressure water spray nozzles to obtain semi-finished product, where moisture content of the semi-finished product is maintained at less than or equal to 25%, (d) adding the semi-finished product to granulator to obtain granules having particle diameter of 6-12 mm and particle length of 6-20 mm, (e) subjecting the granules to sterilization at 60-100 degrees C for 30-90 minutes, and (f) drying sterilized product until moisture content of the product reaches less than or equal to 20%, and cooling and packaging the product. The composition comprises 15-35 wt.% maifanite tailings, 10-30 wt.% activated clay waste residue, 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 semi-finished product comprises 45-75 wt.% carbonized maifanite tailings, 5-25 wt.% waste compost, 0.2-10 wt.% diammonium phosphate, 0.5-5 wt.% expanded perlite, 0.1-5 wt.% superabsorbent resin, 0-3 wt.% ferrous sulfate and 0-35 wt.% water. The waste compost is prepared by obtaining 35-75 wt.% crushed waste and 25-65 wt.% water, adding the crushed waste to pool for immersing the crushed waste in water, and composting the crushed waste immersed in water for 10-30 days.