The invention relates to a method for producing low carbon chemical ethanol from C6 sugar alcohol. Chinese patent disclosed number CN1683293A discloses a method for producing dihydric alcohol and andpolyhydric alcohol by cracking sorbierite. The method comprises the steps of converting the sorbierite into glycol, propanediol and glycerin, but process data and a process route as well as products do not achieve good industrial production requirements. The method mainly adopts a continuous process to hydrocrack the C6 sugar alcohol to generate a low carbon ethanol mixture and finally obtains a single (or mixed) product by separating and refining in alkaline environment, in the presence of a nickel chrome catalyst and at high temperature and high pressure. The process route has the advantages of simple process, easy operation, high yield in unit time and variety of the products; and as the catalyst has different selectivities, the composition rate of the produced products can be substantially adjusted.