The invention relates to a one-time forging all-fiber molding process for a cylinder body forge piece with a lug. The one-time forging all-fiber molding process comprises the following steps of 1, blanking and heating; 2, pre-upsetting; 3, blind hole extrusion; 4, lug forging; and 5, edge cutting and punching. According to a traditional process, the lug is molded by conducting manual drawing-out,double heating and cylinder portion locating molding on a large-specification material. By means of the process, when a blind hole cylinder body is extruded, quantitative precise distribution of a lugforging material is completed, double heating is not needed, and oxide skin generated in the heating process is removed through pre-upsetting; locating is conducted through a cylinder portion in thelug forging process; the process is simplified, efficiency is improved, and the cost is lowered; appearance quality and comprehensive mechanical performance of products are improved; and the concentricity of a blind hole and the cylinder portion is guaranteed.