Preparation method of high-strength polyvinyl alcohol gel

The invention discloses a preparation method of polyvinyl alcohol high-strength gel, and belongs to the technical field of polymer gel preparation. The preparation method comprises the following steps: firstly, heating and dissolving to obtain a polyvinyl alcohol solution, then adding low-concentration inorganic salt with a salting-out effect into the polyvinyl alcohol solution, uniformly stirring and mixing to obtain a polyvinyl alcohol and inorganic salt composite solution, and performing primary freezing and unfreezing on the composite solution to obtain polyvinyl alcohol gel; and putting the polyvinyl alcohol gel into a saturated sodium citrate solution to obtain the high-strength polyvinyl alcohol gel. The high-strength hydrogel has isotropic high strength and high modulus, and the strength of the high-strength hydrogel can reach 10 MPa. The preparation method is simple in process, regular large-size polyvinyl alcohol high-strength gel can be prepared, and the gel is expected to be used for bone repair a