NOVELTY - Producing ethanol involves mixing wood fiber raw material with dilute acid by continuous impregnation; dehydrating material; processing the dehydrated material after vacuum blasting to give porous fluffy wet material of pentose; wet washing it to give pentose solution of cellulose and lignin material; adding pentose solution to water, to give dry matter concentration; hydrolyzing cellulase to obtain enzymolysis liquid of hexose; fermenting the liquid to give fermented mash (A1); fermenting pentose solution with bacteria to give fermented mash (B1); and mixing the mash (A1) and mash (B1).    USE - For producing ethanol using wood fiber raw material selected from corn straw, rice straw, wheat straw, straw or beanstalk (claimed), where ethanol is used as a fuel in combustion industry.    ADVANTAGE - The process produces ethanol having high yield, and high purity i.e. 95%; is environment-friendly process; and reduces energy consumption of the subsequent ethanol concentration.    DETAILED DESCRIPTION - Producing ethanol using wood fiber raw material involves mixing wood fiber raw material with dilute acid by continuous impregnation at 20-80 degrees C for 1-15 minutes; then dehydrating the material at 80-200 degrees C and at a pressure of 0.4-10 MPa for 1-35 minutes, to obtain dehydrated material; processing the material after vacuum blasting, to obtain porous fluffy wet material of pentose; wet washing the pentose-containing porous fluffy material via water at 10-100 degrees C, to obtain pentose solution containing cellulose and lignin containing material; adding the pentose solution containing cellulose and lignin containing material to water at 30-70 degrees C, to prepare dry matter concentration; hydrolyzing cellulase at a pH of 1-7 for 8-120 hours to obtain enzymolysis liquid containing hexose; fermenting the enzymolysis liquid containing hexose at 20-45 degrees C and at a pH of 3-8, under anaerobic fermentation for 8-120 hours to obtain fermented mash (A1); fermenting the pentose solution with bacteria at 20-45 degrees C and at anaerobic condition having pH value of 3-8 for 12-144 hours to obtain fermented mash (B1); and then mixing and concentrating the fermented mash (A1) and fermented mash (B1), to obtain the 95% ethanol.