A robust and sensitive conductive nanocomposite hydrogel with bridge cross-linking–dominated hierarchical structural design has been developed. This hydrogel is fabricated by self-assembly-induced bridge cross-linking of MgB₂ nanosheets and polyvinyl alcohol (PVA) hydrogels. The hierarchical lamellar microstructure combined with robust molecular B–O–C covalent bonds results in exceptional strength and toughness. The hydrogel exhibits high sensitivity to deformation, with a response/relaxation time of 20 milliseconds and a detection lower limit of ~1 Pascal. These properties make it suitable for soft sensing applications. The hydrogel's mechanical performance is enhanced by the synergistic energy dissipation mechanisms from its hierarchical lamellar structure and multiple molecular bonds. The hydrogel also demonstrates exceptional noncontact speaking sensing ability, enabling accurate and stable detection of verbal commands. Additionally, it shows good biocompatibility, as demonstrated by in vitro and in vivo studies. The hydrogel's unique nanoscale layered structure allows for noticeable nanoscale deformation even under minimal force, leading to enhanced conductivity. The hydrogel can be used in various applications, including soft electronics, e-skins, soft robotics, energy, and biomedical applications. The hierarchical design strategy provides an effective approach for developing robust and functional hydrogels with advanced capabilities.A robust and sensitive conductive nanocomposite hydrogel with bridge cross-linking–dominated hierarchical structural design has been developed. This hydrogel is fabricated by self-assembly-induced bridge cross-linking of MgB₂ nanosheets and polyvinyl alcohol (PVA) hydrogels. The hierarchical lamellar microstructure combined with robust molecular B–O–C covalent bonds results in exceptional strength and toughness. The hydrogel exhibits high sensitivity to deformation, with a response/relaxation time of 20 milliseconds and a detection lower limit of ~1 Pascal. These properties make it suitable for soft sensing applications. The hydrogel's mechanical performance is enhanced by the synergistic energy dissipation mechanisms from its hierarchical lamellar structure and multiple molecular bonds. The hydrogel also demonstrates exceptional noncontact speaking sensing ability, enabling accurate and stable detection of verbal commands. Additionally, it shows good biocompatibility, as demonstrated by in vitro and in vivo studies. The hydrogel's unique nanoscale layered structure allows for noticeable nanoscale deformation even under minimal force, leading to enhanced conductivity. The hydrogel can be used in various applications, including soft electronics, e-skins, soft robotics, energy, and biomedical applications. The hierarchical design strategy provides an effective approach for developing robust and functional hydrogels with advanced capabilities.