Method for preparing methyl levulinate through clean conversion of biomass sugar and separating methyl levulinate

The invention discloses a method for preparing methyl levulinate through the clean conversion of biomass sugar and separating methyl levulinate. The method comprises the following steps: 1, calcinating a solid acid at 300-700DEG C for 1-5h; 2, adding a biomass sugar methanol solution with the mass concentration of 10-200g/L and the solid acid to a high pressure reactor to obtain a mixed solution; 3, heating the mixed solution to 180-220DEG C, and keeping the temperature for 1-5h; 4, cooling to room temperature, and separating a solid catalyst from a liquid product by filtering; 5, carrying out normal pressure distillation on the liquid product to remove low boiling point substances to obtain a residue; and 6, adding a distillation assistant to the residue, and carrying out reduced pressure distillation to obtain methyl levulinate. The method of the invention, which adopts the clean solid super acid to catalyze the conversion of the biomass sugar into methyl levulinate and has the advantages of no corrosion to equipment, easy separation of the catalyst from the product, environment protection and the like, accords with the greening development trend of the current chemical industry.