The invention belongs to the technical field of functional polymer materials, and particularly relates to high-strength self-repairing conductive magnetic PVA (Polyvinyl Alcohol) hydrogel and a preparation method thereof. The method comprises the steps of wrapping polyaniline into the surface of nano-crystalline cellulose, immobilizing MnFe2O4 magnetic particles, then adding into a PVA water solution, uniformly mixing, and preparing the high-strength self-repairing conductive magnetic PVA hydrogel. A nano-crystalline cellulose/polyaniline/ MnFe2O4 compound is utilized, so that the PVA hydrogelhas high strength, electrical conductivity and magnetic performance at the same time, three defects of low strength, no electrical conductivity and no magnetism of common PVA hydrogel are overcome, and the PVA hydrogel has a higher application value.