NOVELTY - Preparation device of oxygen liquid fuel comprises biomass rapid thermal cracking oil manufacturing system (I) for preparing bio oil; bio oil oil-water phase separation system (II) for receiving bio oil and separating bio oil; oil phase bio oil chemical looping hydrogen production system (III) for receiving oil phase bio oil and generating hydrogen and low-valence metal oxide; water phase bio oil catalytic hydrogenation system (IV); and oxygen liquid fuel fractionation and purification system (V) for receiving gas phase product and converting into oxygen liquid fuel.    USE - Preparation device of oxygen liquid fuel.    DETAILED DESCRIPTION - Preparation device of oxygen liquid fuel comprises biomass rapid thermal cracking oil manufacturing system (I) for preparing bio oil; bio oil oil-water phase separation system (II) for receiving bio oil and separating bio oil into oil phase bio oil and water phase bio oil to convey to oil phase bio oil chemical looping hydrogen production system (III) and water phase bio oil catalytic hydrogenation system (IV); oil phase bio oil chemical looping hydrogen production system (III) for receiving oil phase bio oil and generating hydrogen and low-valence metal oxide, and conveying hydrogen to water phase bio oil catalytic hydrogenation system (IV); and water phase bio oil catalytic hydrogenation system (IV) for receiving water phase bio oil and hydrogen with catalyst for low-temperature catalytic hydrogenation reaction to generate hydrogen phase product; and oxygen liquid fuel fractionation and purification system (V) for receiving gas phase product and converting into oxygen liquid fuel, with cooled water converted into steam after adsorbing heat, and sent into oil phase bio oil chemical looping hydrogen production system (III). An INDEPENDENT CLAIM is included for a preparation of oxygen liquid fuel by catalytic conversion of bio oil comprising performing thermal cracking to biomass to obtain bio oil, performing water phase and oil phase separation, producing hydrogen by performing chemical looping method to oil phase bio oil, providing hydrogen source to water phase bio oil, performing two-step catalytic hydrogenation in slurry bed, separating product and purifying to obtain oxygen liquid fuel.    DESCRIPTION OF DRAWING(S) - The drawing shows a plan view of the preparation device of oxygen liquid fuel.