NOVELTY - A material containing carbon reducer and silica is smashed into powder, the powder material is sieved, heated and saturated impurities are removed, to obtain reaction material. Then, carbon reducer after removing impurities is mixed with silica and heated, to obtain silicon oxide and carbon monoxide. The silicon oxide gas is subjected to dismuation reaction using crucible, reacted with hydrofluoric acid or grinded into powder, separated, dried, placed in solidification furnace, solidified and impurities are removed, to obtain high-purity silicon powder.    USE - Manufacture of high-purity silicon for manufacturing solar energy battery (claimed).    ADVANTAGE - The method provides silicon having high purity and reduced content of boron and phosphorus.    DETAILED DESCRIPTION - A material containing carbon reducer and silica is smashed into powder having grain size of less than 0.5 mm using ball mill, the powder material is graded and sieved, to obtain a reaction material (A) having grain size of less than 0.3 mm. The reaction material (A) is placed in a vacuum furnace, heated at 1000 degrees C or more for 0.1-4 hours under pressure of less than 1.33 Pa, and the saturated impurities such as phosphorus, aluminum, sulfur, chlorine, antimony and arsenic are removed, to obtain reaction material (B) having reduced phosphorus content. Then, the carbon reducer after removing impurities is uniformly mixed with silica in a mol ratio of 1-8:1, placed in a vacuum furnace and heated at 700-1800 degrees C, to obtain silicon oxide and carbon monoxide. The obtained silicon oxide gas is subjected to dismuation reaction using crucible at reduced temperature to obtain reaction material (C) containing high-purity silicon and silica having boron and phosphorus content of less than 0.5 ppm. The obtained reaction material (C) containing silicon (a) and silica (b) is reacted with hydrofluoric acid by immersing hydrofluoric acid having concentration of 5-40 weight% for more than 30 minutes and heated at 1412-1730 degrees C, or the reaction material (C) is grinded into powder having grain size of 0.15 mm and heated at 1412-1730 degrees C, to obtain silicon liquid. The silicon liquid is separated from silica solid to obtain reaction material (D) containing high-purity silicon and silica. The high-purity silicon of reaction material (D) is dried in vacuum drier at 80-120 degrees C for more than 30 minutes under pressure of 1000 Pa or less, the dried silicon powder is placed in vacuum directional solidification furnace, solidified, and the impurities are removed at 1420-1580 degrees C under the pressure of less than 5 Pa and tension rate of less than 10 cm/h, to obtain silicon powder having purity of more than 99.9999 weight% and reduced amount of boron and phosphorus. The carbon reducer is bamboo charcoal, charcoal, coking coal and/or lignite. The silica is high-purity silica ore, waste optical fiber and/or quartz.