The invention discloses a method for producing
furfural by the aid of pre-
hydrolysis liquid of
eucalyptus. The method includes steps of (1), washing
eucalyptus chips, then
steaming the
eucalyptus chips by the aid of steam, squeezing,
grinding and tearing the eucalyptus chips by the aid of double-screw squeezing fluffers, arranging the ground eucalyptus chips in cooking vessels, adding water into the cooking vessels and carrying out
hydrolysis on the eucalyptus chips to obtain the pre-
hydrolysis liquid of the eucalyptus; (2), carrying out reaction on the pre-hydrolysis liquid of the eucalyptus and
sulfuric acid to obtain the
furfural. The
pentose extraction rate can reach the maximum value of 57.51% under preferable conditions, and the
furfural yield can reach the maximum value of 71.89% under the technical conditions that the temperature is 180 DEG C, the concentration of H2SO4 is 0.25%, the gas extraction speed is 15 mL / min and the concentration of
xylose is 17.8 g / L. The method has the advantages that the pre-hydrolysis liquid of the eucalyptus is reasonably utilized for preparing the furfural, the eucalyptus is subjected to screw squeezing and
grinding pre-treatment, and accordingly the
utilization rate of the eucalyptus in late-
phase reaction can be increased; preparation processes are adjusted, so that the pre-hydrolysis liquid does not contain
fiber polysaccharides such as
cellobiose and cellotriose, pyrogenic reaction can be reduced, and the furfural yield can be effectively increased.