Abstract: Herein,Lignin from evodia lepta was used as raw material to depolymerize under the coupling of deep eutectic solvent（ChCl-MeOH-AlCl₃·6H₂O）and catalyst（Cu（OAc）₂/1,10-phenanthroline）to generate feedstock for synthesising high-density jet fuel,and the effects of different reaction temperatures,times,solid-liquid ratios,catalyst additions and oxygen pressures on the catalytic oxidative depolymerization of lignin were investigated. The results showed that under the conditions of solid-liquid ratio of 1∶30 g/mL,mass ratio of lignin to Cu（OAc）₂ and 1,10-phenanthroline of 1∶1∶1,oxygen pressure of 3 MPa and 60 ℃ for 3 h,the lignin was selectively depolymerized to produce aromatic aldehydes and ketones used as feedstock for synthesizing high-density jet fuel. The lignin conversion rate reached 80.84%,and the yields of acetovanillone and vanillin were 16.69% and 34.39%,respectively.