In order to prepare hydrogel with good mechanical properties and electrical conductivity, HPMC/P(AM-co-AA)-Zr4+/NaCl double network hydrogel was prepared by in situ radical polymerization with acrylamide (AM) and acrylic acid (AA) as comonomers and Zr4+ as crosslinking agent in the presence of hydroxypropylmethyl cellulose (HPMC). The mechanical properties, electrical conductivity and related sensing properties of the hydrogel were studied. The results show that the fracture strain of HPMC/P(AM-co-AA)-Zr4+/NaCl hydrogel is 1820%, the fracture strength is 0.77 MPa, the fracture energy is 4210 kJ/m3, and the conductivity is 8.44 S/m, which can realize the balance of mechanical properties and electrical conductivity. The hydrogel has good recovery ability and high strain sensitivity, showing a wide strain window (0–800%), which is expected to be used for strain sensors.