Conductive hydrogels are ideal building blocks to fabricate wearable electronics. However, their performance still suffers from harsh environmental conditions. Herein, a self-healable, environmental temperature resistant, NIR light-induced photothermal responsive and conductive double network hydrogel (MXCNH) was prepared by integrating photothermal reagent of well-dispersible polydopamine-modified MXene (MXene@PDA) into a carboxymethylcellulose sodium (CMC Na) as the first network, flexible poly( N-(2-hydroxyethyl)acrylamide- co- N-isopropylacrylamide) P(HEAA- co-NIPAm) as the second network matrix in ethanol-water binary solution via UV polymerization. The optimized hydrogel showed excellent mechanical properties (stress/strain of 666.4 kPa/2141 %), adhesion (936 kPa for steel), and conductivity (0.61 S/m), enabling strain sensors with high gauge factor (2.05 at 200–400 % strain). Further, MXCNH hydrogel-based triboelectric nanogenerator (MX-TENG) exhibited enhanced 15.2 % V OC (158.44 V at 61.2 °C) upon a NIR light irradiation. MX-TENG also generated favorable electrical output performances (open-circuit voltage: V OC = 126.61–178.62 V) and long-term stability (stable after one month storage) in ranging from −20 °C to 50 °C. These remarkable comprehensive properties enabled applications in self-powered sensing and energy harvesting with a wide temperature range. Meanwhile, MXCNH hydrogel served as a wearable heater for NIR-triggered thermal management, demonstrating significant potential for clinical treatments.