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An efficient ChCl-MeOH-AlCl 3 ·6H 2 O-Ru-C catalytic system was developed, and ChCl-MeOH-AlCl 3 ·6H 2 O-DES could effectively help to improve the performance of Ru-C, which achieved a high yield of aromatic small aromatic phenol ketones, VMK, SA, DMH and DHE (92.4%). And ChCl-MeOH-AlCl 3 ·6H 2 O-DES could achieve high selective lignin dissolution (93.1%) from Evodia lepta residue. [Display omitted] • ChCl-MeOH-AlCl 3 ·6H 2 O DES was developed for in-situ lignin hydrogenolysis. • Ru-C in the DES significantly improved the product yield and profile. • The system led to 93.1% delignification and 95.3% cellulose retention. • The system led to a high total aromatic phenol ketone yield of 92.4%. • Ru-C performance was improved by the DES system. A deep eutectic solvent (DES) system of ChCl-MeOH-AlCl 3 ·6H 2 O was developed for simultaneous dissolution of lignin from Evodia lepta residue and in-situ hydrogenolysis of lignin to aromatic phenol ketones using a Ru-C catalyst. The use of this DES led to a delignification of reached 93.1 % and cellulose and hemicellulose retentions of 95.3 % and 47.8 % respectively at the molar ratio of 1:12:0.2. While the total aromatic phenol ketones yield reached 92.4 % under 130 °C for 3 h with 17.2 % yields of vanillyl methyl ketone, 9.1 % syringylacetone, 25.4 % dihydroeugenol, and 40.7 % 4-propyl-2,6-dimethoxyphenol. The improved Ru-C properties in the DES system like thermal stability, the specific surface area and reduction potential contributed on the exceptional high product yields. The aromatic phenol ketones were 312.5 % higher than the reported yields of hydrogenolysis of aromatic monomers by ethanol/1,4-dioxane/formic acid under 300 °C–2 h conditions. [ABSTRACT FROM AUTHOR]