The invention discloses lead-free glass powder for solar batteries. The lead-free glass powder is prepared from bismuth oxide, antimony oxide, zinc oxide, boracic acid, silicon oxide, rhenium oxide and strontium oxide. The invention further discloses pure silver paste containing the lead-free glass powder. Products of the lead-free glass powder are uniform in granule and good in dispersity, and the softening point is between 420 DEG C and 480 DEG C; components of zinc oxide, silicon oxide and boron oxide can improve the chemical stability and heat stability of glass, and the boron oxide component can further reduce the thermal expansion coefficient of the glass powder; bismuth oxide serves as a redox active additive, the stability of the antimony oxide component in the glass powder preparation is promoted, and the precipitation of metal bismuth is avoided; besides, the preparation method of the glass powder is simple in process, glass prepared from the glass powder is small in granule size and uniform in performance, better sintering of conductive silver powder can be further promoted, so that an electrode is more compact, the good ohmic contact is formed, the series resistance is reduced, and therefore the efficiency of battery pieces is improved, and the service life of the battery pieces is prolonged.