NOVELTY - A lithium-ion battery tin-mesoporous carbon-3 nanocomposite anode material preparing method involves dissolving triblock copolymer as templating agent in hydrochloric acid solution after adding tetraethylorthosilicate and distilled water. The obtained mesoporous silica material SBA-15 is added to a solution containing sugar, concentrated sulfuric acid and a solution of distilled water and heated. Sucrose is added and carbonized. The obtained mesoporous carbon-3 and tin(II) chloride dehydrate are added to distilled water and decompressed. The obtained tin oxide/CMK-3 is carbonized.    USE - Method for preparing lithium-ion battery nanocomposite anode material.    ADVANTAGE - The method enables preparing lithium-ion battery nanocomposite anode material with easy charging and discharging expansion/contraction volume, stable electrodes, increased initial capacity and improved cycle performance in simple, cost-effective and eco-friendly manner.    DETAILED DESCRIPTION - A lithium-ion battery tin-mesoporous carbon-3 nanocomposite anode material preparing method involves weighing certain amount of templating agent Pluronic 123 (RTM: Poly(ethyleneoxide)-block-poly(propyleneoxide)-block-poly(ethyleneoxide) triblock copolymer) dissolved in 2 mole/L hydrochloric acid solution at 35 degrees C, after adding a certain amount of tetraethylorthosilicate and distilled water and continuously stirring for 5-12 hours. The solution is transferred to a reaction kettle, hydrothermally aging at 120 degrees C for 24 hours, washed with water, after filtration and drying, and carbonized under nitrogen protection at room temperature to 550 degrees C and maintained the temperature for 5 hours and naturally cooled at room temperature after heating to obtain mesoporous silica material (SBA-15). The SBA-15 is added to a solution containing a certain amount of sugar, concentrated sulfuric acid and a solution of distilled water at 100-160 degrees C, heated for 6 hours. Certain amount sucrose, concentrated sulfuric acid and distilled water are added at 100-160 degrees C and heated at 877 degrees C for 6 hours under nitrogen protection before cooling. The product is carbonized with 5% hydrogen fluoride solution to remove the template, and washed with distilled water and dried at 120 degrees C. Finally the sample is added to the 1 mole/l concentrated sulfuric acid solution to reflux at 80 degrees C for 3 hours, washed and dried to obtain the mesoporous carbon CMK-3. Certain amount obtained CMK-3 and certain amount tin(II) chloride dehydrate are added to distilled water, decompressed for 2-5 hours under ultrasonic power of 60-100 W, after washed and dried to obtain tin oxide/CMK-3. The obtained tin oxide/CMK-3 is carbonized at room temperature of 400-800 degrees C under hydrogen protection, maintained the temperature for 3-8 hours at heating rate of 0.5-5 degrees C/minute, calcined and cooled to room temperature to obtain tin-mesoporous carbon-3 nanocomposite anode material.