By adopting solution spin coating and high-vacuum evaporation process, trichromatic organic photodetectors with planar and heterojunction hybrid device structures were prepared. The experiment was used to explore the active layer thickness, mixing degree of different components and the influence of the pre-absorption layer on the photoelectric properties of the device. On this basis, sample preparation and testing of trichromatic organic photodetectors were performed. The results show that the absorption of light by the photodetector device of the hybrid structure covers almost the entire visible light region, and exhibits a broad spectrum response similar to that of the platform-type light in the range of 350~700 nm.Under the bias voltage of -1 V, the detectivity of red, green, and blue light are 2.89×1011 Jones, 3.22×1011 Jones, and 1.97×1011 Jones, respectively. It shows that the device has good detection effects on red, green and blue light, in particular, the detectivity of red light rise up 3 to 4 times.