This work reports the development of the intrinsically stretchable organic photodetector (IS-OPD) that exhibits strain-induced detectivity(D) enhancement, enabled by designing mechanically robust and efficient bilayer-type photoactive architecture (EBL-D). Specifically, we incorporate percolated polymer donor (PD):elastomer networks at the bottom layer, which simultaneously offer excellent stretchability and charge transport. Subsequently, we deposit a small-molecule acceptor layer atop the PD:elastomer layer, expanding the optical absorption range into the near-infrared region while minimizing charge recombination. The resulting EBL-D based IS-OPD maintains high responsivity and effectively suppresses dark current under strain. Consequently, the device exhibits 1.5-fold improvement in specific detectivity from 1.9×1013 to 2.8×1013 Jones under 75% strain, which is the first time to demonstrating strain-induced D enhancement in OPDs.