Self-driving mobile device for land maintenance, comprising a support frame bearing: - movement means configured to allow or determine a movement of the mobile device, said movement means defining a support plane for the mobile device; - at least one work tool configured to perform maintenance operations; - an operating body carrying and/or housing said work tool, wherein said mobile device extends: - in length between a front portion and a rear portion to define a longitudinal axis of the mobile device, - in height along a vertical axis orthogonal to said longitudinal axis and to said support plane, - in width along a transverse axis between a left side, interposed as connection between the front portion and the rear portion of the mobile device, and a right side, also interposed as connection between the front portion and the rear portion of the mobile device, said right side being opposite and positioned at a distance from said left side, said transverse axis being orthogonal to said longitudinal axis, wherein said mobile device comprises at least: - a traction motor operatively connected to the movement means for driving and moving the mobile device, - at least one obstacle detector configured to detect one or more obstacles during a movement of the mobile device, - at least one actuator effective between said operating body and said support frame and configured to allow said operating body to be moved transversely to said support frame, - at least one control unit operatively connected to said traction motor, said obstacle detector and said actuator, characterised in that said mobile device comprises one or more rails constraining the operating body to the support frame and configured to allow the movement of the operating body along at least one translation axis, said translation axis being parallel or coincident with said transverse axis or said translation axis defining with said transverse axis an angle less than 45°. - movement means configured to allow or determine a movement of the mobile device, said movement means defining a support plane for the mobile device; - at least one work tool configured to perform maintenance operations; - an operating body carrying and/or housing said work tool, wherein said mobile device extends: - in length between a front portion and a rear portion to define a longitudinal axis of the mobile device, - in height along a vertical axis orthogonal to said longitudinal axis and to said support plane, - in width along a transverse axis between a left side, interposed as connection between the front portion and the rear portion of the mobile device, and a right side, also interposed as connection between the front portion and the rear portion of the mobile device, said right side being opposite and positioned at a distance from said left side, said transverse axis being orthogonal to said longitudinal axis, - in length between a front portion and a rear portion to define a longitudinal axis of the mobile device, - in height along a vertical axis orthogonal to said longitudinal axis and to said support plane, - in width along a transverse axis between a left side, interposed as connection between the front portion and the rear portion of the mobile device, and a right side, also interposed as connection between the front portion and the rear portion of the mobile device, said right side being opposite and positioned at a distance from said left side, said transverse axis being orthogonal to said longitudinal axis, wherein said mobile device comprises at least: - a traction motor operatively connected to the movement means for driving and moving the mobile device, - at least one obstacle detector configured to detect one or more obstacles during a movement of the mobile device, - at least one actuator effective between said operating body and said support frame and configured to allow said operating body to be moved transversely to said support frame, - at least one control unit operatively connected to said traction motor, said obstacle detector and said actuator, - a traction motor operatively connected to the movement means for driving and moving the mobile device, - at least one obstacle detector configured to detect one or more obstacles during a movement of the mobile device, - at least one actuator effective between said operating body and said support frame and configured to allow said operating body to be moved transversely to said support frame, - at least one control unit operatively connected to said traction motor, said obstacle detector and said actuator, characterised in that said mobile device comprises one or more rails constraining the operating body to the support frame and configured to allow the movement of the operating body along at least one translation axis, said translation axis being parallel or coincident with said transverse axis or said translation axis defining with said transverse axis an angle less than 45°.