A rapid photodetector based on a graphene/black phosphorus/molybdenum disulfide/graphene heterojunction, comprising a substrate (10), a first electrode (20), a second electrode (30), a first graphene layer (40), a black phosphorus thin film layer (50), a molybdenum disulfide layer (60), and a second graphene layer (70). The first electrode (20) and the second electrode (30) are arranged at an interval on a surface on one side of the substrate (10), the first electrode (20) and the second electrode (30) forming a channel structure. The first graphene layer (40), the black phosphorus thin film layer (50), the molybdenum disulfide layer (60) and the second graphene layer (70) are sequentially stacked in the channel structure, the first electrode (20) and the second electrode (30) contacting the first graphene layer (40) and the second graphene layer (70) respectively. A graphene/black phosphorus/molybdenum disulfide/graphene heterojunction is provided in the photodetector, and thus wideband response is implemented, and the response speed of the photodetector is markedly improved. The response speed can reach the microsecond scale, which is beneficial for broad application of the photodetector.
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