Abstract: A conductive organic hydrogel with exceptional mechanical properties was synthesized through a synergistic effect of metal coordination and salting out. Initially, sodium alginate (SA), methylcellulose (MC), and acrylamide (AM) were mixed in solution to prepare the composite hydrogel matrix. Subsequently, a composite hydrogel characterized by enhanced mechanical strength, superior fatigue resistance, and notable conductivity was obtained. The first network was formed through immersion in a saline solution in the way of metal coordination, and the secondary network was constructed by the polymerization of AM in the hydrophobic area of MC. Finally, the impact of SA content, soaking time and types of salt solutions on the mechanical properties of the composite hydrogels was investigated. The results indicate that the MC/PAM/SA-Fe³⁺ hydrogel obtained by soaking in Fe₂(SO₄)₃ solution for 5 h exhibits the best comprehensive mechanical properties with a water content of approximately 60%, tensile strength of (748.2±43.6) kPa, elongation at break of (329.4±17.4)%, elastic modulus of (272.1±3.0) kPa, and toughness of (1338.0±8.6) kJ·m⁻³. Notably, the conductivity of the MC/PAM/SA-Fe³⁺ hydrogel experienced a significant enhancement, reaching a remarkable value of 4.56 S·m⁻¹.