The invention relates to glass powder for front silver paste of crystalline silicon solar cells and a preparation method of the glass powder. The glass powder is characterized by being prepared formula raw materials in parts by mass as follows: 30-80 parts of Bi2O3, 0.1-20 parts of B2O3, 5-30 parts of ZnO, 1-15 parts of SiO2, 0.1-20 parts of BaO, 0-8 parts of Al2O3, 0-6 parts of MgO, 0-5 parts ofTiO2 and 0.1-3 parts of Ag2O. The preparation method comprises the steps as follows: a, the formula raw materials are weighed in parts by mass and uniformly mixed, and a mixture is prepared; b, a crucible is mounted in a resistance furnace, the temperature is increased to 900-1,300 DEG C, the mixture is added, thermal insulation is performed, and clear molten glass is obtained; c, the molten glassis quenched in deionized water, then taken out and dried; d, dried glass is subjected to ball milling and sieving. The glass powder has the advantages as follows: the glass powder for front silver paste of the crystalline silicon solar cells has simple raw material composition and lower cost, contains no lead, vanadium, thallium, tellurium and other harmful elements, conforms to the environmentalprotection requirement, has lower softening point and proper thermal expansion coefficient, has the expansion coefficient matched with a silicon wafer and has low shrinkage rate and high adhesion. Silver paste prepared from the glass powder has high photoelectric conversion rate after being sintered.