Cellulose-based hydrogel as well as preparation method and application thereof

The invention relates to cellulose-based hydrogel as well as a preparation method and application thereof. The preparation method of the cellulose-based hydrogel comprises the following steps: mixing cellulose, a first chemical cross-linking agent, a second chemical cross-linking agent and water to prepare a precursor solution; drying the precursor solution to prepare a dried substance; heating and cross-linking the dried product for 0.1-8 hours to prepare cellulose-based hydrogel; the number of carbon atoms of the first chemical cross-linking agent is less than or equal to 10, and the first chemical cross-linking agent contains at least two carboxyl groups or anhydride groups; the second chemical cross-linking agent is selected from a dicarboxylic acid terminated hydrophilic polymer and a carbon atom number gt; the alkyl acid is provided with at least two carboxyl groups. According to the preparation method of the cellulose-based hydrogel, the toughness and the strength of the hydrogel can be improved, and m