Lithium metal anodes have a great attention for next-generation batteries due to their high capacity and high energy density. Low cycling stability due to lithium dendrites is one of the critical problems in lithium metal anodes. The solid electrolyte has high electrochemical stability with suppressing the growth of lithium dendrites. However, it has the disadvantage of low ionic conductivity compared to conventional liquid electrolytes and poor contact with electrodes. Various researches have been conducted to improve ionic conductivity and compatibility with electrodes by combining polymer and ceramic. In this study, a composite electrolyte is prepared by using the polymer matrix PVDF-HFP (Poly vinylidene fluoride-co-hexafluoropropylene) incorporating bis(trifluoromethane)sulfonimide lithium salt (LiTFSI), and 10 wt% Al-doped LLZO as a filler. The prepared PVDF-HFP/Al-LLZO composite solid electrolyte shows a significant enhancement in ionic conductivity compared to PVDF-HFP alone. The Li/electrolyte/Li symmetric cells confirms a long cycle life of more than 1000 h at 0.5 mA cm-2. Our composite electrolyte could become the first step of the manufacturing next-generation batteries by showing stable cell performance and flexible properties.