A neutron capture therapy system (100), comprising an accelerator (200) for generating a charged particle beam, a transmission device (10) for transmitting the charged particle beam, a neutron generation part (20) for generating a neutron beam by reacting with the charged particle beam, a beam shaping body (30) for performing spectrum adjustment on the neutron beam, and a guidance device (40). The transmission device (10) at least comprises a first transmission part (11) and a second transmission part (12) which is detachably connected to the first transmission part (11), the first transmission part (11) comprises a first position L1 and a second position L2, and the guidance device (40) guides the first transmission part (11) and the neutron generation part (20) to move from the first position L1 to the second position L2; when the first transmission part (11) is located at the first position L1, the neutron generation part (20) provided in the first transmission part (11) is accommodated in the beam shaping body (30); and when the first transmission part (11) is located at the second position L2, the neutron generation part (20) provided in the first transmission part (11) is separated from the beam shaping body (30). The system maintains a safe distance between an operator and the neutron generation part (20), which reduces the time of contact between the operator and radiation, and provides a safe, reliable, and stable solution for recovering the neutron generation part (20).