The battery separator has a small pore size and high porosity, which is easy to retain the electrolyte, has a good liquid absorption rate and a fast penetration rate, and can effectively enhance the retention of active substances and prolong the battery life. The battery separator can stably supply electrolyte to the pole plate and keep the ion conduction smooth. The strong liquid transfer ability can effectively prevent the phenomenon of acid stratification in the battery. The glass fiber is mainly used, and a certain amount of organic fibers are mixed to enhance the tensile strength of the separator and optimize other performance indicators.