This study presents a novel method for fabricating self-encapsulated ionic hydrogel fibers (se-HICFs) using a stress-induced adaptive phase transition strategy. The process involves stretching ultra-stretchable ionic hydrogels (us-IHs) or dip-drawing them from molten us-IHs, which facilitates the directional migration and evaporation of water molecules, leading to a phase transition and self-encapsulation. This results in a sheath-core structure that enhances mechanical strength and stability while providing strong electrostatic induction capabilities. The se-HICFs can be woven into spider web structures and camouflaged in natural environments, enabling high-resolution 3D depth-of-field sensing for various moving media. The study demonstrates the potential of se-HICFs in smart agriculture, environmental monitoring, and homeland security applications.This study presents a novel method for fabricating self-encapsulated ionic hydrogel fibers (se-HICFs) using a stress-induced adaptive phase transition strategy. The process involves stretching ultra-stretchable ionic hydrogels (us-IHs) or dip-drawing them from molten us-IHs, which facilitates the directional migration and evaporation of water molecules, leading to a phase transition and self-encapsulation. This results in a sheath-core structure that enhances mechanical strength and stability while providing strong electrostatic induction capabilities. The se-HICFs can be woven into spider web structures and camouflaged in natural environments, enabling high-resolution 3D depth-of-field sensing for various moving media. The study demonstrates the potential of se-HICFs in smart agriculture, environmental monitoring, and homeland security applications.