A liquid crystal polyester resin composition film made of a liquid crystal polyester resin composition comprising (A) 56 through 99% by weight of a liquid crystal polyester and (B) 44 through 1% by weight of a thermoplastic resin having an epoxy group and molded with uniaxial orientation, with biaxial orientation, by blown film extrusion or by laminating. The above liquid crystal polyester resin composition has an improved behavior in molten state which has been extraordinary in and drawback of the conventional liquid crystal polyesters and is easily molded into a film with excellent mechanical strength heat resistance and gas-barrier properties.