Solvent of cellulose

The invention discloses a solvent of cellulose, and in particular relates to a solvent. The invention aims to provide the solvent of the cellulose, which can dissolve the cellulose at room temperature. The technical proposal comprises that the solvent is a compound solvent of 1-butyl-3-methylimidazolium acetate ion liquid and a dimethyl sulphoxide cosolvent. The mass ratio of the 1-butyl-3-methylimidazolium acetate ion liquid to the dimethyl sulphoxide cosolvent is 2:1-1:5. The solvent is applicable to dissolving the cellulose.