The invention provides a titanium dioxide doped composite hydrogel P(NaSS-MPTC)/TiO2 with ultraviolet shielding and normal temperature self-repairing performances. The composite hydrogel is obtained through a photo-initiated free radical polymerization technology of a cationic liquid and an anionic liquid adopted as copolymerization monomers in a NaCl solution by adopting titanium dioxide nanosol as an ultraviolet screener, a photoinitiator and a cross-linking agent. The light transmittance of the composite hydrogel is detected through ultraviolet-visible spectrum to further research the ultraviolet protection performance of the composite hydrogel. The composite hydrogel has excellent normal temperature self-repairing performance and very good ultraviolet protection performance, so the composite hydrogel can be applied to the ultraviolet shielding field as an ultraviolet screener.