The invention discloses a flexible double-sided heterogeneous light sensing organic photosensitive device of which a top layer and an underlying substrate are formed by a transparent flexible organic substrate, and an intermediate substrate is formed by a non-transparent flexible organic substrate. The structure between the underlying layer and the top layer is composed of indium tin oxide (ITO), an organic photosensitive semiconductor B, a nano-metal thin layer, an organic insulating layer, the ITO, the non-transparent flexible organic substrate, the ITO, the organic insulating layer, the nano-metal thin layer, an organic photosensitive semiconductor A and the ITO which are laminated from the bottom to the top in turn. The thickness of the nano-metal thin layer is 1 nanometer, and metal material of which the thickness is close to that of 10 layers of atoms acts as a current transmission layer. The nano-metal thin layer has great electric field transmittance and light transmittance. The organic photosensitive semiconductor A and the organic photosensitive semiconductor B are organic semiconductor material sensitive to light of different wavelengths. An electric field is applied to the non-transparent flexible organic substrate so as to control the organic photosensitive semiconductor A and the organic photosensitive semiconductor B of double sides to sense light of different wavelengths respectively. The device uses full-flexible organic material so that low-cost and large-area preparation can be realized, and the device can be adhered on the surface of objects of different shapes so as to realize double-sided heterogeneous light sensing.