NOVELTY - An airlift biological diesel oil ester exchange reactor comprises an ester exchange reactor and a fluid phase-split separator (12); where the ester exchange reactor comprises a material entrance (5), a catalyst entrance (6), a connecting pipe (8), a rising pipe (10), and a fluid drop pipe (11); where the rising pipe (10) is set in the fluid drop pipe (11); the top end of the fluid drop pipe (11) is set with the material entrance (5) and the catalyst entrance (6); and the bottom end of the fluid drop pipe (11) is connected to the fluid phase-split separator (12) via the connecting pipe (8).    USE - The airlift biological diesel oil ester exchange reactor is useful for industrial and commercial applications.    ADVANTAGE - The airlift biological diesel oil ester exchange reactor increases the reaction speed in the biological diesel production compared with traditional mechanic agitation type reactor, increases the raw material converting rate, and achieves low cost and high yielding rate.    DETAILED DESCRIPTION - An airlift biological diesel oil ester exchange reactor comprises an ester exchange reactor and a fluid phase-split separator (12); where the ester exchange reactor comprises a material entrance (5), a catalyst entrance (6), a connecting pipe (8), a rising pipe (10), and a fluid drop pipe (11); where the rising pipe (10) is set in the fluid drop pipe (11); the top end of the fluid drop pipe (11) is set with the material entrance (5) and the catalyst entrance (6); the bottom end of the fluid drop pipe (11) is connected to the fluid phase-split separator (12) via the connecting pipe (8); the fluid phase-split separator (12) mainly comprises a tank body (12.1), a wash exit (12.7), a methanal exit (12.3), a glycerol exhaust (12.6), a flow isolating baffle plate (12.4), a light phased fluid level meter (12.2), and a heavy phased fluid level meter (12.5); the light phased fluid level meter (12.2) and the methanal exit (12.3) are at the top end of the tank body (12.1); the glycerol exhaust (12.6) and the heavy phased fluid level meter (12.5) are at the bottom end of the tank body (12.1); the bottom of the tank body (12.1) is set with the wash exit (12.7); the flow isolating baffle plate (12.4) is in the tank body; the ester exchange reactor also comprises a gas generator (2), a middle storage tank (3), a condenser (4), a gas distributor (7), an ultrasonic generator (1), and an ultrasonic wave pipe (9); an end of the gas generator (2) is connected to the rising pipe (10) via the pipeline, and the other is orderly connected to the fluid drop pipe (11) via the middle storage tank (3) and the condenser (4); the gas distributor (7) is arranged at the lower end of the rising pipe (10); the ultrasonic wave pipe (9) is at the bottom of the fluid drop pipe (11); and the ultrasonic generator (1) controls the height to diameter (H/D) ratio of the ultrasonic wave pipe (9) and the fluid drop pipe (11) to be 10.7, and the diameter ratio (D1/D) of the rising pipe (10) and the fluid drop pipe (11) to be 0.60.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the airlift biological diesel oil ester exchange reactor.    Ultrasonic generator (1)    Gas generator (2)    Middle storage tank (3)    Condenser (4)    Material entrance (5)    Catalyst entrance (6)    Gas distributor (7)    Connecting pipe (8)    Ultrasonic wave pipe (9)    Rising pipe (10)    Fluid drop pipe (11)    A fluid phase-split separator (12)    Tank body (12.1)    Light phased fluid level meter (12.2)    Methanal exit (12.3)    Flow isolating baffle plate (12.4)    Heavy phased fluid level meter (12.5)    Glycerol exhaust (12.6)    Wash exit (12.7)