Abstract: Hydrogel sensors were promising for flexible wearable applications, but their poor long-term storage stability, difficulty in on-demand customization and multi-signal coupling constrained the applications. A rapid rehydration lamination strategy based on prefabricated dry film was proposed to construct long-term storable hydrogel dry film prefabricated parts by encapsulating nanofibers with the all-biomass polysaccharide composite KSC (konjac glucan/sodium alginate/cellulose nanofibers). The application utilized a water-triggered interlayer Ca²⁺ and —COO⁻ metal coordination mechanism to achieve high-strength interfacial bonding (400 kPa) within 1.5 min. Experiments shows that the prefabricated dry film has >98% retention of performance after 12 months of storage, and the mechanical properties (1.37 MPa) are significantly better than those of the conventional hydrogel (0.09 MPa). The conductive fiber design of TPU-CNTs (thermoplastic polyurethanes-carbon nanotubes) is oriented to give the device anisotropic response (680% difference in resistance between 0° and 90° directions). Combined with dual-channel signal difference resolution (173.7% increase in resistance for outer layer stretching and 55.5% decrease in resistance for inner layer compression), the device realizes decoupling of complex curved surface motion with a response time as low as 100 ms. The assembled multilayer sensor demonstrates excellent stability and decoupling ability in human joint motion, solves the problems of poor storage stability and high cost of customization of hydrogel devices, and provides an opportunity to transition the flexible electronic devices from laboratory preparation to industrialization. This provides a new paradigm for the transformation of flexible electronics from laboratory preparation to industrialization, and has important application value in the fields of medical monitoring and intelligent robotics.