The invention discloses chitosan/zwitter-ion and acrylic acid copolymer double network self-healing hydrogel and a preparation method thereof, and relates to the technical field of hydrogel. The hydrogel is of a double network structure, and formed by a first network and a second network in a mutually penetrating mode, the first network is a physical cross-linking network formed by chitosan and polyvalent negative ions, the second network is a copolymer network formed by a zwitter-ion monomer and an acrylic acid monomer, the first network intersperses in the second network, the chitosan and the polyvalent negative ions are selected to form the first network, the zwitter-ion monomer and the acrylic acid monomer are selected to form the second network, the double network self-healing hydrogel, obtained by the cross-linking purely physical effect, with the mutually interspersed first network and the second network makes the hydrogel have excellent mechanical performance and self-healing ability, the high relative resistance change rate is provided when deformation occurs, and the chitosan/zwitter-ion and acrylic acid copolymer double network self-healing hydrogel has broad applicationprospects in the field of soft electronics, especially as biomedical sensors.