The invention discloses a preparation method of tellurite glass powder for silicon solar battery positive electrode silver paste.The preparation method is characterized in that by molar percentage, 40-70% of TeO2, 5-20% of Bi2O3, 5-35% of GeO2, 0-30% of V2O5, 0-35% of B2O3, 1.8-4% of La2O3 and 3-8% of ZnO are weighed and blended, postprocessing steps including mixed material fine grinding and drying, glass melting, secondary fine grinding and the like are conducted, and the tellurite glass powder for silicon solar battery positive electrode silver paste is obtained.By the adoption of the prepared tellurite glass powder, no lead is contained, and it is beneficial to protect the environment and the human health; the tellurite glass powder is good in adaptation to a silicon substrate and silver, is matched with the silicon substrate and silver in coefficient of thermal expansion and is good in chemical stability, moderate in softening temperature and particularly suitable for a binding phase of the silicon solar battery positive electrode silver paste.