Strain of trichoderma reesei and culture method and use thereof

A method for preparing xylooligosaccharides, comprising the following steps:

• preparing a premix by crushing and sieving corncobs and adding water thereto;
• subjecting the premix to high-temperature and high-pressure treatment to obtain a crude extract liquid of xylan, wherein the treatment is performed at a treatment temperature from 95° C. to 140° C. and a treatment pressure of 0.05 to 0.25 MPa;
• adjusting the crude extract liquid of xylan to a mass concentration of 4% to 6% and to a pH between 4.2 and 4.8, and performing a microwave treatment to obtain a xylan solution, wherein the microwave treatment is performed at a microwave frequency of 2450 MHz and a treatment temperature from 40° C. to 55° C. for a microwaving time of 10 to 25 minutes;
• adding a xylanase into the xylan solution to perform enzymolysis to obtain a crude xylooligosaccharide solution;
• wherein the xylanase used is a xylanase produced by the following strain:
• said strain is Trichoderma reesei BLCY-007, which has an Accession number:
• CGMCC No. 17970, which was obtained when the strain was deposited on Jun. 14, 2019 in China General Microbiological Culture Collection Center (CGMCC);
• subjecting the crude xylooligosaccharide solution to enzyme inactivation treatment, decolorization treatment, ion exchange treatment, and concentration treatment to obtain an xylooligosaccharide solution.