Stretchable electronic devices have attracted extensive interest because of their potential applications for next-generation wearable electronic devices. Intrinsically stretchable semiconducting layers are important for the fabrication of large-area and simple integration processing of electronic devices with uniform electronic properties. The stretchability of semiconducting layers can be enhanced by rational molecular structure design of the side-chain or backbone of conjugated polymers. Recently, the side-chain engineering has been focused on the field of polymeric electronics since it can greatly enhance the solubility and electrical properties of polymers. Herein, we report diketopyrrolepyrrole(DPP)-based copolymers functionalized with urethane side-chain for applications as stretchable electronics. These polymers have three different backbone units. Because of the dynamic non-covalent bonding of urethanes, the fabricated semiconducting layers showed good stretchability as well as self-healable properties. Our results demonstrate the high potentials of urethane side-chain substituted DPP-based polymers for next-generation wearable electronics.