Lignin　is　the　only　renewable　aromatic　material　in　nature　and　contains　a　large　number　of　oxygen-containing　functional　groups.　High-value　and　green　utilization　of　＂lignin-to-chemicals＂　can　be　realized　via　using　lignin　to　produce　fine　chemicals　such　as　phenols　and　carboxylic　acids,　which　can　not　only　reduce　the　waste　of　lignin　in　the　process　of　lignocellulosic　biomass　treatment,　but　gradually　make　the　substitution　of　traditional　fossil　fuels　come　true.　The　hydrogenolysis　process　under　catalysis　of　metal　catalyst　has　high　product　selectivity　and　less　impurity,　which　is　suitable　for　the　production　of　same　type　or　single　fine　chemicals.　Hydrogenolysis　of　lignin　via　metal　catalysts　to　produce　lignin　oil,　and　further　modification　of　functional　groups　(e.g.　methoxyl,　alkyl　and　hydroxyl　group)　of　depolymerized　monomers　in　the　bio-oil　to　yeild　phenols　and　terephthalic　acid　are　reviewed,　and　catalytic　mechanisms　are　briefly　summarized　in　this　paper.　Finally,　the　problems　of　lignin　catalytic　conversion　existing　currently　are　investigated,　and　the　future　development　of　this　field　is　also　prospected.