Glass powder for sealing and preparation method thereof

The invention relates to the technical field of sealing glass, and discloses a glass powder for sealing and a preparation method thereof, and the preparation method comprises the following steps: in a platinum crucible, weighing the following raw materials according to the weight percentage, calculating the amount of substance, mixing according to the percentage, and uniformly stirring to form a mixture A, 30-40% of Bi2O3, 20-40% of ZnO, 10-20% of B203 and 10-30% of SiO2 are added, the mixture B is uniformly mixed to form a mixture C, by adding Bi2O3, the lead element in the original preparation mode can be replaced, Bi2O3 is a bismuthate system, and the bismuth element and the lead element are similar in chemical property, melting point and thermal expansion coefficient, so that the bismuth oxide is the best substance for replacing lead oxide, and the lead oxide can be used for preparing the lead oxide. According to the invention, the use of the lead element in the preparation process can be effectively redu