The invention relates to a non-curling flexible composite material, which is prepared by the following method: (1) high tenacity polyester filament is adopted as warp, nylon monofilament is adopted asweft, woven fabrics manufactured by a plain weaving process of a Sulzer gripper loom are adopted as framework materials; and (2) after the framework materials in the step (1) are processed by gum dipping and pre-setting, a double-sided PVC film is adopted for hot melting and jointing, and after cooling and surface treatment, the non-curling flexible composite material is prepared. The flexible composite material prepared by the invention has excellent non-curling performance, and simultaneously has the characteristics of high ink absorption, high strength, aging resistance and the like.