NOVELTY - Preparation of membranes for high-security lithium-ion secondary battery, comprises: (a) selecting a membrane substrate with thickness of 9-40 mu m and pre-treating its surface: treating the surface of the substrate membrane using chemical oxidation process or physical process to improve its surface tension to 35-50 dynes; (b) preparing inorganic ceramics glue solution for coating: mixing polymerization monomer with organic solvent; stirring; and adding evocating agent; and (c) coating surface of the substrate: coating the surface of the substrate to form the double-coating structure.    USE - The process is useful for preparing membranes for high-security lithium-ion secondary battery (claimed).    ADVANTAGE - The process is smart in combining coating and drying the surface of the membrane and the polymerization reaction to form a drying process of only one step; thus, the liquid membrane formed from the inorganic ceramics glue solution on the surface of the substrate is solidified by polymerization reaction.    DETAILED DESCRIPTION - Preparation of membranes for high-security lithium-ion secondary battery, comprises: (a) selecting a membrane substrate with thickness of 9-40 mu m and pre-treating its surface: treating the surface of the substrate membrane using chemical oxidation process or physical process to improve its surface tension to 35-50 dynes; (b) preparing inorganic ceramics glue solution for coating: mixing polymerization monomer with organic solvent for uniformly stirring using a common compulsory mixer; adding inorganic ceramics powder to the mixed solution; stirring using a common high-speed turbine-type mixer for 1-2 hours and carrying out microcosmic scale mixing using a super-fine globe mill for 1-3 hours; and adding evocating agent to the obtained mixture for stirring using a common agitator tank within 1-3 hours before using the inorganic ceramics glue solution; where the components of the inorganic ceramics glue solution comprises 30-50 pts.wt. of inorganic ceramics powder with surface that is modified with oleophylic dispersion stabilizer, and has a grain diameter of 10-300 nm; 5-20 pts.wt. of polymerization monomer; oil-soluble evocating agent that is 0.3-1.5% of the polymerization monomer with an evocation half life period of less than 2 hours at 60 degrees C; and 20-35 pts.wt. of organic solvent; and (c) coating surface of the substrate: coating the surface of the substrate to form the double-coating structure; where the material and thickness of the two coatings are same; the glue spread calculated according to double-surface coating is controlled at 0.06-0.4 mg/cm2; the thickness of one single coating is 0.8-4 mu m; temperature for drying is 50-85 degrees C; the speed for coating the membrane is 3-10 m/minute; and the time for the membrane staying in dry oven is 1-5 minutes.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the prepared membrane for high-security lithium-ion secondary battery.