Patients with hand dysfunction require joint rehabilitation for functional restoration, and wearable electronics can provide physical signals to assess and guide the process. However, most wearable electronics are susceptible to failure under large deformations owing to instability in the layered structure, thereby weakening signal reliability. Herein, an in-situ self-welding strategy that uses dynamic hydrogen bonds at interfaces to integrate conductive elastomer layers into highly robust electronics is proposed. This strategy enables the interlocking of functional layers with different microstructures, achieving high interfacial toughness (e.g., ≈700 J m