NOVELTY - Catalyzing and extracting esterified bio-oil under microwave condition, comprises: adding ethanol, acetic acid, furfural, oxyful and a catalyst into a kjeldahl flask, introducing a magnet, placing the kjeldahl flask into a microwave reactor, adding condensed water, setting the reaction temperature to 45-85 degrees C, where the reaction time is 10-60 minutes and agitating speed is 400 plus minus 2 rotations/minute, reacting by microwave heating and pouring the reacted solution out after the reaction, where the zinc chloride-modified cation exchange resin 732 catalyst is 0.15% zinc ion/732 resin.    USE - The method is useful for catalyzing and extracting esterified bio-oil under microwave condition.    ADVANTAGE - The method: uses catalyst of high activity; exhibits a high transformation rate of 70.37% for acetic acid and 57.71% for furfural.    DETAILED DESCRIPTION - Catalyzing and extracting esterified bio-oil under microwave condition, comprises: adding ethanol, acetic acid, furfural, oxyful and a catalyst into a kjeldahl flask, introducing a magnet, placing the kjeldahl flask into a microwave reactor, adding condensed water, setting the reaction temperature to 45-85 degrees C, where the reaction time is 10-60 minutes, agitating speed is 400 plus minus 2 rotations/minute and microwave power is 100-400 W, reacting by microwave heating and pouring the reacted solution out after the reaction, where the zinc chloride-modified cation exchange resin 732 catalyst is 0.15% zinc ion/732 resin and 0.15% is the mass ratio of the metal in the catalyst. The zinc ion is the metal ion exchanged on 732# resin. The mass ratio of ethanol, acetic acid and furfural is 3.80: 1.57: 1.12: 1 and the mass ratio of the catalyst to the reaction solution is 1: (20-155). The zinc chloride-modified cation exchange resin 732 catalyst is heated under microwave condition, mixed with ethanol, reacted to catalyze and the acidic matters are extracted in bio-oil, where the mixed solution of ethanol, acetic acid and furfural is used as the simulation for complicated bio-oil system and oxyful containing hydrogen peroxide (30%) oxidizes the furfural into acidic matter which is added with ethanol and esterified by zinc chloride-modified cation exchange resin 732 catalyst. A normal-pressure microwave auxiliary synthesizing and extracting microwave reactor is used as the reacting device.