The adjustable working voltage of device is realized by changing the ratio of donor-acceptor in the active layer of the organic detector. The influence mechanism of different PC61BM concentration on the hole tunneling injection voltage in PBDT-TT-F∶PC61BM∶C60 photoelectronics multiplication device was studied. Under the adjacent 600% external quantum efficiency value, by adjusting the concentration of PC61BM, we can obtain a low device operating voltage of －3 V and a high device operating voltage of －6 V. The results show that the hole transport ability and exciton dissociation efficiency of the active layers are changed by adjusting PC61BM concentration, which causes the change of the collection efficiency of hole injection current for anode. Finally, the regulation of device operating voltage is achieved. This paper provides an universal method for obtaining photoelectronics multiplication organic photodetectors with facile fabrication, low and controllable operating voltage.