NOVELTY - Glyoxal solution, sodium hydroxide solution and dispersant-containing silver nitrate solution are mixed, and precipitated at controlled feed rate. The pH and reaction temperature of reaction mixture are maintained at 8-10 and 20-40 degrees C, respectively. Reaction mixture is stirred and silver grain complete crystallization is carried out. Benzotriazole corrosion inhibitor is added to obtained reaction mixture, stirred, and silver powder surface passivation is carried out. Silver powder is isolated by filtration, washed and dried to obtain high-density monodispersed silver powder.    USE - Manufacture of high-density monodispersed silver powder for solar energy battery.    ADVANTAGE - The method safely and economically provides spherical and smooth high-density monodispersed silver powder having excellent glossiness, narrow particle size distribution, high quality, average particle size of 1.2-1.8 mu m, bulk density of 2-2.5 g/cm3, and tap density of 4.5-5 g/cm3, with yield of 97-99.5% and reduced consumption of reducing agent, without affecting the environment.    DETAILED DESCRIPTION - A glyoxal solution having concentration of 0.5-1 mol/L and sodium hydroxide or potassium hydroxide solution having concentration of 0.5-1 mol/L are prepared. Silver nitrate is dissolved in deionized water, and 0.2-1 %mass polymer dispersant with respect to content of silver nitrate is added and dissolved. The obtained dispersant-containing silver nitrate solution is diluted to the concentration of 0.5-1 mol/L. To a glass reactor, glyoxal solution, sodium hydroxide solution and silver nitrate solution are added in the molar ratio of 1:0.25-0.35:1-1.4, and precipitated at controlled feed rate. The pH and the reaction temperature of the reaction mixture is maintained at 8-10 and 20-40 degrees C, respectively. The reaction mixture is continuously stirred and silver grain complete crystallization is carried out. 0.02-0.1 %Mass benzotriazole corrosion inhibitor is added to the obtained reaction mixture containing silver nitrate solution, stirred for 15 minutes, and silver powder surface passivation is carried out. Silver powder is then isolated by filtration process, washed with deionized water and ethanol successively and dried at 80 degrees C to obtain high-density monodispersed silver powder.