The invention discloses a PE diaphragm used for a novel energy storage battery. The PE diaphragm is prepared from, by mass, 12 parts of high-density polyethylene, 24 parts of fumed silica, 50 parts of special oil, 1 part of polyethylene color masterbatch and 1 part of antioxidant. Diaphragm production is carried out according to the following steps that 1, the raw materials are weighed according to the proportion and mixed for over 30 minutes, and uniform mixing is ensured; an extruder is used for extruding, a forming machine is used for forming, the thickness is 0.6-0.8 mm, the extruding temperature is 150 DEG C-190 DEG C, and extruding pressure is 5-20 MPa; a formed sheet is fed into an extraction machine, normal hexane or trichloro ethylene is added for carrying out ultrasonic extraction to form a diaphragm with the needed porosity, and normal hexane or trichloro ethylene is recovered by means of air lifting and drying; after detection, packaging is carried out to obtain a final product. The PE diaphragm used for the novel energy storage battery is formed through the special process and formula, and has good corrosion resistance and oxidation resistance.