A photon emission detection device comprising: a treatment bed; and a detecting portion including a first detecting portion and a second detecting portion on two sides of the treatment bed respectively; and wherein the first detecting portion and the second detecting portion move away from or close to each other so that the detecting portion forms a ring whose radius is configured to be increased or decreased, and the ring surrounds the treatment bed, wherein each of the first detecting portion and the second detecting portion is mounted with a probing device configured to rotate relative to the treatment bed, and the detecting portion detects gamma rays generated by a boron neutron capture reaction through the probing device; the photon emission detection device further comprises a first supporting frame and a second supporting frame respectively disposed on the two sides of the treatment bed; the first supporting frame and the second supporting frame have the same structure characterized in that the first supporting frame comprises a first pedestal configured to move on the ground, a first telescopic arm connected to the first pedestal and configured to stretch and retract in a vertical direction, and a first extending arm located at one end of the first telescopic arm and connected to the first detecting portion, and the first detecting portion is disposed at the first extending arm; the second supporting frame comprises a second pedestal configured to move on the ground, a second telescopic arm connected to the second pedestal and configured to stretch and retract in the vertical direction, and a second extending arm located at one end of the second telescopic arm and connected to the detecting portion, the second detecting portion is disposed at the second extending arm; and the first supporting frame moves away from or close to the treatment bed in response to moving of the first pedestal, and the second supporting frame moves away from or close to the treatment bed in response to moving of the second pedestal. a treatment bed; and a detecting portion including a first detecting portion and a second detecting portion on two sides of the treatment bed respectively; and wherein the first detecting portion and the second detecting portion move away from or close to each other so that the detecting portion forms a ring whose radius is configured to be increased or decreased, and the ring surrounds the treatment bed, wherein each of the first detecting portion and the second detecting portion is mounted with a probing device configured to rotate relative to the treatment bed, and the detecting portion detects gamma rays generated by a boron neutron capture reaction through the probing device; the photon emission detection device further comprises a first supporting frame and a second supporting frame respectively disposed on the two sides of the treatment bed; the first supporting frame and the second supporting frame have the same structure characterized in that the first supporting frame comprises a first pedestal configured to move on the ground, a first telescopic arm connected to the first pedestal and configured to stretch and retract in a vertical direction, and a first extending arm located at one end of the first telescopic arm and connected to the first detecting portion, and the first detecting portion is disposed at the first extending arm; the second supporting frame comprises a second pedestal configured to move on the ground, a second telescopic arm connected to the second pedestal and configured to stretch and retract in the vertical direction, and a second extending arm located at one end of the second telescopic arm and connected to the detecting portion, the second detecting portion is disposed at the second extending arm; and the first supporting frame moves away from or close to the treatment bed in response to moving of the first pedestal, and the second supporting frame moves away from or close to the treatment bed in response to moving of the second pedestal.