A neutron therapy device (100), comprising a beam forming body (10), a neutron generating component (11) provided within the beam forming body (10), a tube (20) for transmitting an ion beam (P) to the neutron generating component (11), a deflection electromagnet (30) for changing a transmission direction of the ion beam (P), and a collimator (40). The beam forming body (10) comprises a decelerator (12) and a reflective body (13) disposed around the periphery of the decelerator (12). The neutron generating component (11) generates a neutron after being irradiated by the ion beam (P). The decelerator (12) decelerates the neutron generated by the neutron generating component (11) to a preset energy spectrum. The reflective body (13) returns a deviating neutron to increase the neutron intensity in the preset energy spectrum. The tube (20) has an axial line and the beam forming body (10) can rotate about the tube (20) to irradiate a body (M) to be irradiated from different angles. Owing to the configuration of a supporting frame (60), the beam forming body (10), and the deflection electromagnet (30), the neutron therapy device (100) needs only to rotate the structure thereof to enable the entire neutron therapy device (100) to perform irradiation from different angles. The device has a simple structure and convenient operations, and can be realized easily.Ce dispositif de traitement par neutrons (100) comprend un corps de mise en forme (10) de faisceaux, une partie de formation (11) de neutrons se trouvant dans le corps de mise en forme (10) de faisceaux, un faisceau (20) destiné à transmettre un faisceau d'ions (P) vers la partie de formation (11) de neutrons de telle sorte que le sens de transmission du faisceau d'ions (P) produise un fléchissement par électroaimant (30) et un collimateur (40), le corps de mise en forme (10) de faisceau comprenant un corps ralentisseur (12) et un corps réfléchissant (13) sur le pourtour externe du corps ralentisseur (12). La partie de
