Addressing the urgent demand in the field of flexible sensors for materials that combine excellent mechanical properties with multimodal sensing capabilities, in this study, a thermoresponsive conductive hydrogel based on sodium carboxymethyl cellulose ( CMC )-derived macromolecular crosslinker was designed and synthesized. The synthesis process was systematically optimized, and the structure-property relationships were thoroughly analyzed to validate its bimodal sensing potential in human motion monitoring and health management. A novel crosslinking agent was prepared via one-step grafting reaction, enabling the simultaneous integration of chemically crosslinked networks and dynamically entangled networks within the hydrogel. The resulting material exhibits outstanding mechanical performance and electrical conductivity. In the strain range of 25% ~ 300% , the response time is less than 1 s, with a relative resistance change (ΔR/R₀) fluctuation below 5% after 100 cycles, demonstrating its capability for real-time monitoring of joint bending motions. Furthermore, the lower critical solution temperature of the hydrogel is consistent with the range of human body temperature, enabling visualized early warning of fever anomalies.