A radiotherapy device (100) based on a mechanical hand (120) moving a radiation therapy head (110), said radiotherapy device (100) comprising: the radiation therapy head (110), comprising a shielding body (111), a source-carrying body (112) and a collimation body (113), the shielding body (111) covering the source-carrying body (112) and the collimation body (113), the collimation body (113) fitting with the source-carrying body (112) the mechanical hand (120), comprising an execution mechanism (121), a drive mechanism (122) and a control mechanism (123), the execution mechanism (121) being detachably connected to the shielding body (111), the control mechanism (123) controlling movement of the execution mechanism (121), the drive mechanism (122) driving the execution mechanism (121) so as to drive the radiation therapy head (110) to rotate or move in any direction a therapy bed (130), arranged below the radiation therapy head (110) a source storage apparatus (140), accommodating the radiation therapy head (110) when the radiotherapy device (100) is in a completed operation state. The radiotherapy device (100) uses the mechanical hand (120) to control the radiation therapy head (110) to move accurately to a lesion position according to a therapy plan. Therapy is more flexible and the service life of the radiotherapy device (100) is extended.Linvention concerne un dispositif de radiothérapie reposant sur une tête de radiothérapie déplacée par une main mécanique comprenant: une tête de radiothérapie comprenant un corps de protection, un corps de support de source et un corps de collimation, le corps de protection recouvrant le corps de support de source et le corps de collimation, le corps de collimation sajustant avec le corps de support de source une main mécanique comprenant un mécanisme dexécution, un mécanisme dentraînement et un mécanisme de commande, le mécanisme dexécution étant raccordé de manière amovible au corps de protection, le mécanisme de commande comm
