NOVELTY - Combined production of superfine silver powder and calcium pyruvate comprises stirring and adding silver nitrate solution, sodium hydroxide solution and methylglyoxal solution into a glass reactor, reacting to form superfine silver powder and sodium pyruvate solution, reacting at 20-30 degrees C under pH of 9-11 for 0.5-1 hours, heating to 40-50 degrees C, stirring continuously and reacting for 0.5-1 hour, filtering to obtain superfine silver powder, vacuum concentrating the filtered liquid, adding calcium acetate solution, reacting and precipitating to obtain calcium pyruvate.    USE - The method is useful for combined production of superfine silver powder and calcium pyruvate. Calcium pyruvate is useful in weight-loss product. The silver powder is useful for preparing solar battery silver paste (all claimed) or electronic touch screen conductive silver paste.    ADVANTAGE - The method produces silver powder with 99.1-100% molar yield and calcium pyruvate with 70-86% molar yield (claimed), realizes complete utilization of raw materials, reduces generation of waste, reduces production cost, and is safe and environmentally friendly.    DETAILED DESCRIPTION - Combined production of superfine silver powder and calcium pyruvate comprises (i) diluting industrial grade methylglyoxal solution and adding organic dispersing agent accounting for 0-2% of industrial grade methylglyoxal solution to obtain 0.5-1 mol/l organic dispersing agent containing methylglyoxal solution, (ii) respectively dissolving silver nitrate and sodium hydroxide in deionized water and diluting to obtain 0.5-1 mol/l silver nitrate solution and 1 mol/l sodium hydroxide solution, (iii) stirring and adding silver nitrate solution, sodium hydroxide solution and methylglyoxal solution into a glass reactor, reacting to form superfine silver powder and sodium pyruvate solution, where the molar ratio of silver nitrate, methylglyoxal and sodium hydroxide is 1:0.5-0.7:1-1, controlling feeding rate of the reaction mixture to obtain grey-white precipitate, and reacting at 20-30 degrees C under pH of 9-11 for 0.5-1 hours, (iv) heating to 40-50 degrees C, stirring continuously and reacting for 0.5-1 hour to complete the reaction, (v) filtering to separate silver powder, washing using deionized water and ethanol, and drying at 80 degrees C to obtain superfine silver powder, and (vi) vacuum concentrating the filtered liquid to one third of the original volume at 50-60 degrees C after separation of silver powder, stirring and adding calcium acetate solution, reacting at 20-40 degrees C and precipitating to obtain calcium pyruvate, where the molar ratio of methylglyoxal and calcium acetate is 1:0.4-0.6, and (vii) filtering and separating the precipitated calcium pyruvate, washing with deionized water, and drying.