The traditional electrically conductive adhesives (ECAs) include heterogeneous metallic and/or carbon-based fillers blended with the organic adhesive polymer matrix. However, those heterogeneousblended ECAs have serious challenges with aggregation, weight, synthetic complexity, large filler contents, and price. This work reports a metal-free, high-performance, and electrically conductive fully organic polymer adhesive, poly(N-methacryloyl-3,4-dihydroxyl-L-phenylalanineco-3-sulfopropyl methacrylate):poly(3,4-ethylenedioxythiophene) (PMS:PEDOT), that is excellently dispersible in water, easy-to-use, lightweight, highly flexible, and biocompatible and has a low-process temperature (23 °C). The new ECA, PMS:PEDOT is prepared in two steps. First, a flexible linker containing copolymer, which possesses the bioinspired adhesive moiety catechol and sulfonate, is synthesized by radical polymerization. Second, EDOT is oxidatively polymerized in the presence of the flexible copolymer matrix to prepare the new ECA (PMS:PEDOT). The PMS:PEDOT exhibits high electrical conductivity up to 2.5 S/cm after annealing and glycerol addition. The bulk adhesion test (lap shear strength tests) showed 1.62 MPa which is much higher than various other commercial adhesives such as epoxy, glass bonder, and ethylene vinyl acetate-based hot melt. This newly developed ECA successfully demonstrates an efficient electrical connection on a circuit board and PET film. This work introduces a new class of materials, a fully organic conducting polymer adhesive, which will become essential for fast growing applications including conducting ink, bioelectronics, batteries, photovoltaics, and ultrathin microsized electronic devices.