NOVELTY - Water-bio oil system comprises esterification system (I) with bio-oil storage tank (1), aqueous biological pump (2) and esterification reactor (3); catalytic hydrogenation system (II) with hydrogen storage tank (4), hydrogen compressor (5), catalytic hydrogenation reactor (6), solid-liquid separation device (7), catalyst regeneration device (8) and catalyst storage tank (9); and separation and purification system (III) with gas-liquid separator (10), sampling points (11) and mixed alcohol shunt device (12).    USE - Water-bio oil system used in preparing mixed alcohol-based liquid fuel (claimed).    ADVANTAGE - Water-bio oil system lowers acidity, improves stability and catalytic hydrogenation activity, and improves yield of mixed alcohol.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation of mixed alcohol-based liquid fuel comprising taking water phase bio-oil raw material, esterifying, converting water phase bio-oil with organic acid into ester, carrying out catalytic hydrogenation to generate solid-liquid mixture, separating using solid-liquid separating device (7), separating catalyst, sending catalyst into catalyst regeneration device (8), sending regenerated catalyst into catalyst storage tank (9), heating and evaporating, separating and purifying, taking gas-phase product into gas-liquid separator (10), cooling, fractionating, and sampling.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of water-bio oil system (Drawing includes non-English language text).    Oil storage tank (1)    Aqueous biological pump (2)    Esterification reactor (3)    Hydrogen storage tank (4)    Hydrogen compressor (5)    Catalytic hydrogenation reactor (6)    Solid-liquid separation device (7)    Catalyst regeneration device (8)    Catalyst storage tank (9)    Gas-liquid separator (10)    Sampling points (11)    Mixed alcohol shunt device (12)    Esterification system (I)    Catalytic hydrogenation system (II)    Separation and purification system (III)