The invention belongs to the technical field of chemical industry, particularly relates to a process for producing furfural from bagasse. The process comprises the following steps: 1) washing the bagasse with water to remove impurities and residual sucrose and sandy soil; 2) mixing the washed bagasse with an alkali solution, carrying out a countercurrent reaction, and then performing squeeze drying for standby application; 3) performing instantaneous steam explosion treatment at low temperature; 4) washing materials after steam explosion with water; 5) performing continuous countercurrent extraction with a KOH solution; 6) performing emulsification on hemicellulose, acetic acid and solvents in an emulsifier; and the like. According to the process, the low temperature steam explosion is used, hemicellulose is retained, and the low temperature alkaline liquid extraction is adopted, so that the extraction rate of hemicellulose is improved. By adopting the existing technology, the physicochemical property of methanol to separate and precipitate hemicellulose dissolved in the alkaline solution is used, the hydrophobic effect is formed by methanol, the affinity effect between hemicellulose and the alkaline solution is destroyed, and the efficient separation and in-situ precipitation of hemicellulose from the alkaline methanol solution is promoted, so that the efficient extraction ofhemicellulose is achieved.