A rapid photodetector based on a graphene/molybdenum disulfide/graphene heterojunction, comprising a substrate (10), a first electrode (20), a second electrode (30), a first graphene layer (40), a molybdenum disulfide layer (50), and a second graphene layer (60). 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 molybdenum disulfide layer (50), and the second graphene layer (60) 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 (60) respectively. The provision of the graphene/molybdenum disulfide/graphene heterojunction in the photodetector causes a marked increase in the response speed of the photodetector. The response speed can reach the millisecond scale, aiding in broad application of the photodetector.
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