Recently, the use of liquid electrolytes in lithium batteries is prone to cause safety problems such as leakage and gas explosions. The PEO-based solid composite electrolytes have been studied for a possible replacement for liquid electrolytes. However, it results in degradation of mechanical properties and short circuit during cycling at the high temperature above 70°C. Therefore, the thickness of electrolytes is required to be 200㎛ or more. As a method for reducing the thickness, the composite slurry, which was composed of polymer ionic conductor, lithium salts and Garnet-type LLZO, was filled in a porous polyester nonwoven. And then, it was rolled at a constant ratio to have a thickness of 50~100㎛. The morphology of the solid composite electrolyte film sheet was observed using SEM. Furthermore, the electrochemical properties were measured by the AC impedance method and charge/discharge cell test.