The invention relates to a novel battery separation membrane, which comprises a base layer and separation membrane layers arranged on both sides of the base layer, wherein the base layer sequentially comprises a nylon layer, a grid layer and a polypropylene layer from bottom to top, and the separation membrane layer sequentially comprises a thermal insulation layer and a protection layer from inside to outside. With the embodiments of the present invention, the novel battery separation membrane has the following beneficial effects that: the battery separation membrane simultaneously has characteristics of a certain mechanical strength, good ion transmission capability, chemical corrosion resistance, electrochemical corrosion resistance and electrolyte absorption or repelling ability, and under a certain condition, the battery separation membrane has hydrophilicity so as to ensure the alkali absorption amount and the liquid holding ability while the air permeability of the separation membrane can be improved through the hydrophobicity.