A device (100) is provided for the demolishing and in particular for milling horizontal, vertical and inclined surfaces or layers suitable for pedestrians and/or vehicles such as for instance asphalt and/or concrete roads. The device comprises rotatable working means (10) rotatably fixed to a main supporting frame (T) which comprises a first supporting element (L) and a second supporting element (F). The device also comprises regulating means adapted to adjust the position of the first supporting element (L) with respect to the main frame (T) independently of the position of the second supporting element (F). The regulating means comprise an arm (R) fixed to the main frame (T) so as to be free to rotate or translate. The first supporting element (L) is rotatably fixed to a portion (H) of the arm (L).