Method for producing alkyl glycoside by utilizing starch

The invention discloses a method for producing alkyl glycoside by utilizing renewable starch. The method comprises the following steps: taking the starch as a raw material, taking a nano magnetic solid acid as a catalyst, taking reaction with alcohol at the temperature of 100-200 DEG C for 1-24 hours, and obtaining the alkyl glycoside with high yield. The raw material of the catalyst is a bulk commodity, and a chemical coprecipitation method is adopted to prepare the nano-magnetic solid acid; then the nano-magnetic solid acid can be rapidly separated from the product to be recycled; the obtained alkyl glycoside is an important green environment-friendly surfactant, and can be widely applied to the fields such as food, biology, oil extraction and the like.