Pyrolytic lignin was used by Qin et. because it has a high carbon content and low average molecular mass. It was obtained from bio-oil, and the lignin yield was 23.2%. The lignin was thermally pretreated using a modified gas chromatography oven. It was observed that untreated pyrolytic lignin has hollow structures, and during thermosabilization, these fibers tend to fuse together. Pretreatment strongly affects carbon fiber production. The optimal spinning conditions for pyrolytic lignin were attained at 160°C for one hour at a reduced pressure of 30 kPa. The pretreated lignin was melt-spun at a spinning temperature between 105 and 180°C. Then, the fibers underwent thermostabilization at a rate of 2°C/min at 250°C for 1 hour under tension. Performing thermostabilization under tension induces the molecular orientation in the fibers, which results in better strength. The thermostabilized fibers were carbonized for one hour at 1000°C at a rate of 3°C/min. The carbon fibers that were produced had the same yield and mechanical characteristics as the carbon fibers made from kraft lignin.