The invention provides a solar battery comprising a base plate which comprises a p-n doping structure formed in the base plate, back material which is attached on the base plate, and comprises glass mixture, organic medium, aluminized material and additive, wherein the glass mixture comprises Al2O3, Bi2O5, B2O3, SiO2, PbO, Tl2O3 and ZnO, the content of aluminium powder in the material is 60-80%, the degree of purity is about 90-99.99%, the additive comprises stearic acid of C10-C24, whose content is smaller than 5%, the content of the organic medium is about 20-35%, and comprises 60-90%alcohol ether organic solvent, 10-20%cellulose resin and 1-5% advection agent, rheologic agent or thixotropic agent. The solar battery of the invention can improve the bending of the silicon base plate caused by stress.