NOVELTY - A nanosilver conductive paste preparing method involves preparing nanosilver powder by dropping sodium borohydride solution to silver nitrate solution and polyvinyl alcohol slowly, agitating mixture, separating mixture, and drying mixture. The organic carrier is prepared by dissolving organic binder in solvent. Nanosilver powder is added to organic carrier. Defoaming agent, dispersant, nanoinorganic additive, thickening agent, surfactant and lead-free and environmentally-friendly glass powder are added to mixture and blended followed by rolling and filtering the mixture.    USE - Method for preparing nanosilver conductive paste that is utilized in a nanocrystalline silicon solar cell.    ADVANTAGE - The method enables preparing the nanosilver conductive paste without additional new investment, protecting environment, reducing addition of silver powder and usage of noble silver metal, avoiding existing production equipment, replacing conductivity, printing performance and crystalline silicon substrate adhesion of paste, and expanding application of the nanosilver conductive in nanocrystalline silicon solar cell.    DETAILED DESCRIPTION - A nanosilver conductive paste preparing method involves preparing nanosilver powder, preparing organic carrier, and preparing the nanosilver conductive paste. The nanosilver powder is prepared by dropping 10-30 mmol/l sodium borohydride solution to 0.1-1 mmol/l silver nitrate solution and 1-5 mmol/l polyvinyl alcohol slowly, agitating the mixture in water bath, controlling temperature at 20-70 degrees C till the mixture becomes turbid solution, separating the mixture, washing the mixture with ethyl alcohol, and drying the mixture at 40-50 degrees C to obtain nanosilver powder with particle diameter of 10-100 nm, where the volume ratio of the silver nitrate solution, polyvinyl alcohol solution and sodium borohydride solution is 2:7:1. The organic carrier is prepared by dissolving 20-60 mass% organic binder in 40-80 mass% solvent A, heating the mixture at 70-85 degrees C, blending and filtering the mixture completely to obtain organic carrier (C1), dissolving 15-55 mass% organic binder in 45-85 mass% solvent B, heating the mixture at 70-85 degrees C, and blending and filtering the mixture completely to obtain organic carrier (C2). 15-50 mass% nanosilver powder is added to 35-75 mass% organic carrier (C1) or organic carrier (C2). 1-5 mass% defoaming agent, 1-5 mass% dispersant, 1-5 mass% nanoinorganic additive, 1-5 mass% thickening agent, 1-6 mass% surfactant and 1-7 mass% lead-free and environmentally-friendly glass powder are added to the mixture and blended in mixer for 60-120 minutes. The obtained mixture is rolled with three-roller machine to fineness of less than 10 mu m, and filtered with 800-1200-mesh standard screen to obtain nanosilver conductive paste, where the nanosilver conductive paste, nanosilver powder, organic carrier, defoaming agent, dispersing agent, inorganic nanoadditive, thickening agent, surfactant and lead-free and environmental-friendly glass powder are 100% homemade.