Soft electronics are increasingly important for applications like healthcare monitoring and medical implants. However, poor adhesion and mechanical mismatches often lead to device failure. This paper introduces a self-adhesive conductive polymer with low modulus (56.1–401.9 kPa), high stretchability (700%), high interfacial adhesion (>1.2 MPa), and high conductivity (1–37 S/cm). This material, fabricated by doping poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) with a supramolecular solvent, enables solution-processed electrodes for various soft devices, including electroluminescent devices, electromyography monitoring, and an integrated system visualizing electromyography signals during muscle training. These self-adhesive conductive polymer-based electronics show great potential for creating comfortable and wearable bioelectronic devices.