Abstract: The invention relates to the field of nutrition and the sugar industry and presents a method and apparatus for producing glucose-fructose liquors on an industrial scale from sugar or liquors thereof. The invention uses reactors packed with a catalyst with high hydrolytic activity, and these are installed within a sugar refining factory or in an industry which dissolves it, such that glucose-fructose syrup is produced in a single operation by a continuous flow of the sugar liquor. High levels of hydrolysis may be attained by modification of the residence time. The process of hydrolysis of the sugar does not significantly alter the color of the solution. The product obtained on an industrial scale can be used both in the food industry and in the pharmaceutical industry.