NOVELTY - A polyvinylidene fluoride/lithium aluminum titanium phosphate (PVDF/Li1.3Al0.3Ti1.7(PO4)3) solid two-phase electrolyte thin film material comprises lithium aluminum titanium phosphate solid electrolyte (Li1.3Al0.3Ti1.7(PO4)3) and polyvinylidene fluoride (PVDF) composite material; where the mass ratio is 0.03-0.1:1.    USE - The polyvinylidene fluoride/lithium aluminum titanium phosphate solid two-phase electrolyte thin film material is useful for industrial and commercial applications.    ADVANTAGE - The polyvinylidene fluoride/lithium aluminum titanium phosphate solid two-phase electrolyte thin film material has good mechanical strength, good flexibility, high ionic conductivity, good electric chemical performance, and easy implementation of industrial production.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is a method for preparing the polyvinylidene fluoride/lithium aluminum titanium phosphate (PVDF/Li1.3Al0.3Ti1.7(PO4)3) solid two-phase electrolyte thin film material, comprising: (a) synthesizing Li1.3Al0.3Ti1.7(PO4)3 powder by sol-gel method: adding lithium acetate dihydrate (Li(CH3COO).2H2O) and aluminum nitrate nonahydrate (Al(NO3)3.9H2O) into ethylene glycol monomethyl ether until they are totally dissolved, adding tributyl phosphate (PO(OC4H9)3) and tetrabutyl titanate (Ti(OC4H9)4), continuously stirring the materials, controlling the mass ratio of Li(CH3COO).2H2O, Al(NO3)3.9H2O, PO(OC4H9)3, and Ti(OC4H9)4 at 1.35-1.50:0.3:1.7:3, heating the solution for 2-4 hours at 120-140 degrees C, forming gel, calcining the gel for 3-6 hours at 800-880 degrees C, cooling the gel and grinding the gel, filtering the gel, obtaining Li1.3Al0.3Ti1.7(PO4)3 powder; where the grain diameter of is less than 2 mu m; and (b) preparing PVDF/Li1.3Al0.3Ti1.7(PO4)3 solid two-phase electrolyte thin film material: mixing and stirring PVDF and dimethylformamide, preparing PVDF and dimethylformamide solution, dispersing the Li1.3Al0.3Ti1.7(PO4)3 by dimethylformamide, regulating Li1.3Al0.3Ti1.7(PO4)3-dimethylformamide slurry, then mixing Li1.3Al0.3Ti1.7(PO4)3 and PVDF in the ratio of 0.03-0.1:1 with the Li1.3Al0.3Ti1.7(PO4)3-dimethylformamide slurry, uniformly stirring the mixture, and coating the mixture, controlling the temperature, and molding the solvent; drying the thin film in vacuum, and obtaining PVDF/Li1.3Al0.3Ti1.7(PO4)3 solid two-phase electrolyte thin film.