A system for continuously preparing furfural using lignocellulosic raw material, wherein the system comprises: an acid solution output unit for outputting a first acid solution and a second acid solution, respectively; a raw material mixing unit connected to the acid solution output unit, for mixing the raw material with the first acid solution to form a mixture and continuously conveying the mixture; a feeding unit connected to the raw material mixing unit, for receiving the mixture, compressing the mixture and conveying the mixture outward; a main reaction unit connected to the feeding unit and the acid solution output unit, for receiving the mixture and the second acid solution respectively, and sufficiently stirring and mixing the mixture with the second acid solution under a pressure higher than a normal pressure to cause them to react; a discharging unit connected to the main reaction unit, for performing solid-liquid separation of a resultant obtained from a reaction and outputting an acid-containing pentose solution; a stripping reaction column comprising, at the top, a vapor outlet and a first raw material inlet, and at the bottom, a stripping vapor inlet and an acid solution outlet; wherein the first raw material inlet is for receiving an acid-containing pentose solution of a first temperature from the discharging unit as a raw material for performing a dehydration/cyclization reaction, the stripping vapor inlet is for receiving a stripping vapor of a second temperature, the vapor outlet is for supplying a furfural-containing vapor obtained from the reaction, and the acid solution outlet is for extracting an acid solution from the bottom of the column; a separation unit connected to the vapor outlet, for neutralizing an acid in the furfural-containing vapor and separating the resulting salt from the furfural-containing vapor to provide a furfural-containing vapor with a reduced acid content; and a purification unit for purifying the resulting furfural. an acid solution output unit for outputting a first acid solution and a second acid solution, respectively; a raw material mixing unit connected to the acid solution output unit, for mixing the raw material with the first acid solution to form a mixture and continuously conveying the mixture; a feeding unit connected to the raw material mixing unit, for receiving the mixture, compressing the mixture and conveying the mixture outward; a main reaction unit connected to the feeding unit and the acid solution output unit, for receiving the mixture and the second acid solution respectively, and sufficiently stirring and mixing the mixture with the second acid solution under a pressure higher than a normal pressure to cause them to react; a discharging unit connected to the main reaction unit, for performing solid-liquid separation of a resultant obtained from a reaction and outputting an acid-containing pentose solution; a stripping reaction column comprising, at the top, a vapor outlet and a first raw material inlet, and at the bottom, a stripping vapor inlet and an acid solution outlet; wherein the first raw material inlet is for receiving an acid-containing pentose solution of a first temperature from the discharging unit as a raw material for performing a dehydration/cyclization reaction, the stripping vapor inlet is for receiving a stripping vapor of a second temperature, the vapor outlet is for supplying a furfural-containing vapor obtained from the reaction, and the acid solution outlet is for extracting an acid solution from the bottom of the column; a separation unit connected to the vapor outlet, for neutralizing an acid in the furfural-containing vapor and separating the resulting salt from the furfural-containing vapor to provide a furfural-containing vapor with a reduced acid content; and a purification unit for purifying the resulting furfural.