A single-walled carbon nanotube combined with an organic red light material by a solution spin coating method to produce a red light detector.The influence mechanism of single-walled carbon nanotubes on PBDTTT-F∶PCBM bulk heterojunction active layer film and the photoelectric properties of red photodetector were studied. The performance of the device was characterized and optimized by atomic force microscopy, fluorescence spectroscopy and ultraviolet-visible absorption spectroscopy.When single-walled carbon nanotube is the optimal doping ratio 1.5 wt%, the responsivity of the detector is 535 mA/W under the red light illumination, the detection reaches 3.8×1012 Jones, and the external quantum efficiency reaches 104%. The results show that the combination of single-walled carbon nanotubes and organic red-light materials can improve the aggregation and crystallinity of organic conjugated polymers and enhance the absorption of light, provide high-mobility charge conduction channels for the active layer and optimize the interpenetrating network morphology. At the same time, the multi-exciton generation effect of carbon nanotubes is utilized, the photoelectric performance of organic photoelectric detectors has been greatly improved, the external quantum efficiency exceeds 100%, Providing reference for further development of inorganic-organic photodetectors.