The invention relates to the technical field of solar cells, in particular to a modification method of glass powder for conductive silver paste of a solar cell. The method comprises the following technological processes: glass powder pretreatment, washing, plating of the glass powder with silver and cleaning. According to the method, a pollution-free active agent is used for activation pretreatment on the glass powder, and the surface of the glass powder is plated with a layer of uniform and dense nano-silver with a liquid phase chemical reduction method; sensitization and activation are not needed to be performed with environmental pollution methods adopting precious metal tin, palladium and the like, and the method is simple and environment-friendly. The nano-silver particles on the surface of the glass powder are densely and uniformly deposited, and accordingly, activity and conductivity of the glass powder are improved, and electrical properties of the solar cell silver paste are improved.