This paper presents a dually crosslinked hydrogel, combining a covalently crosslinked acrylic acid (AAC) network with Fe³⁺ ions through dynamic and reversible ionically crosslinked coordination. The hydrogel exhibits remarkable electrical sensitivity (a gauge factor of 3.93 under a strain of 1500%), superior stretchability (a fracture strain up to 1700%), self-healing ability (healing efficiency of 88% and 97% for mechanical and electrical properties, respectively), and 4D printability. These properties are demonstrated by constructing a strain sensor, a two-dimensional touch panel, and shape-morphing structures with water-responsive behavior. The hydrogel's potential for applications in stretchable electronics is highlighted, making it a promising material for future stretchable electronic devices.This paper presents a dually crosslinked hydrogel, combining a covalently crosslinked acrylic acid (AAC) network with Fe³⁺ ions through dynamic and reversible ionically crosslinked coordination. The hydrogel exhibits remarkable electrical sensitivity (a gauge factor of 3.93 under a strain of 1500%), superior stretchability (a fracture strain up to 1700%), self-healing ability (healing efficiency of 88% and 97% for mechanical and electrical properties, respectively), and 4D printability. These properties are demonstrated by constructing a strain sensor, a two-dimensional touch panel, and shape-morphing structures with water-responsive behavior. The hydrogel's potential for applications in stretchable electronics is highlighted, making it a promising material for future stretchable electronic devices.