Special aluminum paste for double-sided back passivation crystalline silicon solar cell and preparation method thereof

The invention provides aluminum paste special for a double-sided back passivation crystalline silicon solar cell and a preparation method of the aluminum paste, and the aluminum paste comprises the following components in percentage by mass: 65-75% of aluminum powder, 0-5% of aluminum-silicon alloy powder, 0-5% of aluminum-boron alloy powder, 15-25% of an organic carrier, 1-5% of glass powder and 0-3% of an additive. The glass powder is prepared from the following components: 15 to 35 percent of V2O5, 30 to 50 percent of BaO, 10 to 30 percent of B2O3, 0 to 15 percent of SiO2, 0 to 15 percent of ZnO, 0 to 15 percent of Al2O3, 0 to 10 percent of PbO, 0 to 10 percent of Bi2O3 and 0 to 10 percent of Sb2O3. The aluminum paste is good in wettability, high in flowing capacity, high in aluminum-silicon filling rate, free of diffusion, low in aluminum wire resistance, small in contact resistance, narrow in wire width, resistant to water boiling, free of aluminum beads, high in adhesive force, weak in corrosion to a pa