The invention relates to a dual-layer floating gate flexible organic memory device and a preparation method therefor. The dual-layer floating gate flexible organic memory device mainly comprises a substrate, a dielectric layer, a control gate, a barrier layer, a first floating gate layer, an isolating layer, a second floating gate layer, a tunneling layer, an organic semiconductor layer, a source electrode and a drain electrode, wherein the source electrode and the drain electrode are positioned above the tunneling layer. A dual-layer gold nanocrystalline is taken as the floating gate layers, so that the memory window of the memory device can be improved, and the working voltage range can be expanded; a femtosecond laser reduction technology is adopted, so that a link of intermediate repeated electrode deposition is reduced, the production process is simplified, the pollution doping in the production is lowered, and the product yield can be improved; the barrier layer, the isolating layer and the tunneling layer adopted by the dual-layer floating gate flexible organic memory device all adopt high-dielectric-constant graphene oxide, so that leakage current can be effectively lowered, the stability of the memory can be improved, and the working voltage can be lowered; all the materials adopted by the memory device are flexible and can be bent, so that the memory device can be applied to flexible circuits; and in addition, the femtosecond laser reduction technology and a vacuum thermal evaporation and spin coating technology adopted in the preparation method of the invention are mature in technology and low in product, so that the large-scale production of the dual-layer floating gate flexible organic memory device can be realized.