Cellulose-based hydrogel and preparation method thereof

The invention relates to a cellulose-based hydrogel and a preparation method thereof. The cellulose-based hydrogel is prepared from the following raw materials: a first cellulose derivative, a second cellulose derivative and a cross-linking agent, the viscosity of the first cellulose derivative in a 1 wt% aqueous solution at 25 DEG C is 3000-6000 cps, and the viscosity of the second cellulose derivative in a 2 wt% aqueous solution at 25 DEG C is 30-700 cps; in the total mass of the first and second cellulose derivatives, the mass content of the first cellulose derivative is 70-95%. According to the cellulose-based hydrogel, the first cellulose derivative and the second cellulose derivative which have different viscosities and are in a specific viscosity range are used as main crosslinking raw materials, the mass content of the first cellulose derivative is regulated, and the first cellulose derivative and the crosslinking agent are jointly used as preparation raw materials to be subjected to crosslinking reac