An electrolyte separator based on the blending of three polymers of polyethylene oxide (PEO)/thermoplastic polyurethane (TPU)/polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) was prepared by phase inversion method. It was soaked in electrolyte which contains 1 mol /L lithium hexafluorophosphate (LiPF6) ethylene carbonate (EC): dimethyl carbonate (DMC): ethyl methyl carbonate (EMC) = 1:1:1 to form a new type of gel polymer electrolyte (GPE). Characterized by SEM, FTIR, XRD, TG, DSC, tensile properties and electrochemical properties. The results showed that the membrane with a polymer ratio of 3:1:4 has a uniform porous morphology, the crystalline peak area is the lowest, the tensile strength reaches 15MPa, and the ion conductivity is 7.9?10^(-3) S?cm，, the best overall performance. The separator with a polymer ratio of 3:1:4 was assembled into a CR2032 button battery for battery cycle performance testing. The results showed that the charge-discharge specific capacity of the battery reached 164 mAh/g and 161 mWh/g at 0.2 C, After 150 cycles, the discharge specific capacity can still be maintained at about 152 mAh/g, and the Coulomb efficiency remains above 97%, making it an excellent battery material.