A wall anchoring device for radiators, comprising a semitubular supporting bracket (13), which can be anchored to the wall, is substantially as long as the radiator (12) is high, is provided with a lower end (14) that is contoured so as to form a fixed hook (15), and is associated with a movable hook (18) at its upper end (16), the movable hook (18) being supported by a contoured support (17) which has a C-shaped cross-section and is retained so as to slide in the bracket (13) between predefined positions and cooperates with means for locking and releasing the sliding (19). The device is characterized in that the locking and release means (19) are constituted by a contoured body (20), which is retained in the support (17) so that it oscillates between its wings and is provided with an elastic means (21), which acts on a corresponding first wing (22) so as to push the contoured body (20) toward an opening (23a) of the second wing (23), at which it has a locking element (24) that acts by contact against the corresponding wing (13a) of the bracket (13), a release actuation lever (25) protruding from the body (20), being available to the action of the user and acting in contrast with the elastic means (21) so as to separate the locking element (24) from the wing (13a) of the bracket (13).