This system enables the automatic opening and closing of cranes, particularly when activating the return to rest sequence, when Automatic Crane Folding must operate without any load, and in accordance with the retraction of the rams (both on the extensions and on the crane itself). In all cases, before activating the automatic closing sequence, the system always pressurises the rams on the crane and the hydraulic extension. The appearance of a specific icon on the radio control unit display screen and an acoustic signal indicate the activation of the Automatic Crane Folding function. The system is deactivated via the same physical quick selection button used for activation.