▎ 摘　　要

NOVELTY - Method for depolymerization of lignin based on sub-molten salt oxidation system comprises subjecting sub-molten salt solution, catalyst, lignin and oxidant to oxidative depolymerization reaction to obtain gas-phase product and liquid-phase product, separating to obtain hydrogen from gas-phase product, cooling the liquid phase product under reduced pressure, adjusting the pH value, filtering, extracting, concentrating and separating to obtain small molecular compound; where the sub-molten salt solution is composed of alkali, inorganic salt and water. USE - Method for depolymerization of lignin based on sub-molten salt oxidation system, which is used in technical field of biomass resource utilization. ADVANTAGE - The method: constructs lignin depolymerization system with inorganic salt and strong alkali; can effectively depolymerize lignin under mild conditions to produce hydrogen and small molecular organics; and creates a new transformation route for the utilization of lignin resources.