A diagnosis system for the automatic diagnosis of the condition of wear of predetermined components of a land vehicle; the system comprising: - a diagnosis station comprising a support base, which is fixed to the ground and is configured to support approximately at ground level at least two wheels of the land vehicle; and an image acquisition assembly, which is coupled to said support base in such a way to be positioned, in use, at least partially below the land vehicle and is configured to acquire images from below of the predetermined components of the land vehicle; the image acquisition assembly comprising two first image acquisition devices (13, 14), each of which is arranged on the support base at a support zone of a respective wheel of the land vehicle and is configured to acquire first images of components of a suspension of the land vehicle in proximity to said respective wheel; the support base comprising two movable plates (18, 19), each of which is configured to support a respective wheel of the land vehicle and to move the respective wheel in a direction (D1; D2) substantially parallel to the ground and substantially parallel to the rotation axis of each wheel; and - a control unit configured to control the movement of each movable plate (18; 19), to control the image acquisition assembly so as to acquire the first images of the predetermined components of the land vehicle when a wheel of the land vehicle is moved by means of the respective movable plate (18, 19) in a direction substantially parallel to the rotation axis of each wheel, and to determine the condition of wear of said components of the suspension as a function of the first acquired images; each first image acquisition device (13, 14) being fixed to the support base in the space comprised between the two movable plates (18, 19). - a diagnosis station comprising a support base, which is fixed to the ground and is configured to support approximately at ground level at least two wheels of the land vehicle; and an image acquisition assembly, which is coupled to said support base in such a way to be positioned, in use, at least partially below the land vehicle and is configured to acquire images from below of the predetermined components of the land vehicle; the image acquisition assembly comprising two first image acquisition devices (13, 14), each of which is arranged on the support base at a support zone of a respective wheel of the land vehicle and is configured to acquire first images of components of a suspension of the land vehicle in proximity to said respective wheel; the support base comprising two movable plates (18, 19), each of which is configured to support a respective wheel of the land vehicle and to move the respective wheel in a direction (D1; D2) substantially parallel to the ground and substantially parallel to the rotation axis of each wheel; and - a control unit configured to control the movement of each movable plate (18; 19), to control the image acquisition assembly so as to acquire the first images of the predetermined components of the land vehicle when a wheel of the land vehicle is moved by means of the respective movable plate (18, 19) in a direction substantially parallel to the rotation axis of each wheel, and to determine the condition of wear of said components of the suspension as a function of the first acquired images;