NOVELTY - The rice hull and mineral-acid aqueous solution are mixed, stirred and filtered, to separate waste residue (I) and xylose aqueous solution. The rice hull hemicelluloses is added to hydrolyzed waste residue (I) and high-boiling wine, reacted and filtered, to separate waste residue (II) and wine liquor. The waste residue (II) is added to vitriol, hydrochloric acid and acetic acid liquor, reacted and filtered, to separate waste residue (III) and extrose aqueous solution. Then, ammonia is added to filtrate and fermented, to obtain ethanol.    USE - Manufacture of fuel ethanol.    ADVANTAGE - The method economically provides fuel ethanol by effectively utilizing the rice hull resource. The method also provides high purity silicon dioxide from the rice hull.    DETAILED DESCRIPTION - The rice hull and thin mineral acid aqueous solution are added to the hydrolysis shuttle, stirred, hydrolyzed at 100 degrees C for 3 hours and filtered, to separate waste residue (I) and xylose aqueous solution. Then, oxide or complex oxide are added to acid xylose aqueous solution and reacted for 1-3 hours under normal pressure, to obtain complex catalyst. Further, the temperature is reduced to 100-200 degrees C, reacted for 1-6 hours, furfural is separated, rectified and purified. The rice hull hemicelluloses is added to the reaction shuttle, hydrolyzed waste residue (I) containing water (50%) and high-boiling wine are added in the ratio of 1:4-10, reacted for 4-8 hours at 160-200 degrees C, and filtered, to separate waste residue (II) and high boiling wine liquor. Then, 2-6 times volume of water is added to filtrate, to obtain lignin. The waste residue (II) is added to 6-10 times of 2 mol/L of vitriol, hydrochloric acid and acetic acid liquor, reacted at 130-180 degrees C for 6-10 hour and filtered, to separate waste residue (III) and extrose aqueous solution. The filtrate is counteracted with ammonia and subjected to fermentation, to obtain ethanol. The waste residue (III) is washed, dried, pyrogenated at 600-850 degrees C, smashed and dispersed, to obtain silicon dioxide nanoparticles having granularity of 30-90 nm and brightness of 99%. Alternately, waste residue (III) is washed, 4-6 times of 2 mol/L of nitric acid liquor or hydrogen peroxide solution liquor is added, reacted at 120-180 degrees C for 2-5 hours, washed and filtered, to obtain silicon dioxide nanoparticles having granularity of 30-90 nm, purity of more than 99.9% and brightness of more than 99%.