NOVELTY - The device has a rotor with vertical axis carrying two radial panels (3) arranged in a homogeneous manner around an axis of the rotor. Inclining units incline the panels from a deployed position until a folded position and vice-versa such that height of the folded position is less than height of deployed position. Fixing units fix the panels to each other when the panels are in deployed position. The inclining units have pivot axles (5) on which the panels are fixed at a level of a lower end of the panels, where the pivot axles extend from a body (9) of the rotor.    USE - Folding wind power device i.e. wind turbine, for mounted on a roof of a vehicle e.g. motor vehicles and camping cars, to convert wind energy into mechanical or electrical energy.    ADVANTAGE - The device with the vertical axis can be easily deployed and folded up to minimize obstruction and arrangement on the roof of a vehicle while ensuring the maintenance of the mechanical properties such as resistance to wind pressure. The panels extend radically with respect to the axis of rotation of the rotor and are placed along vertical direction, so that the device is effective to wind direction for extracting energy. The design of the device avoids damaging the plates or storage box of the device during storing and/or retraction so as to avoid any force lifting the panels that damage the device when applied to the wind passing under the panels. The design of the device ensures mounting a rotor of the device on a telescopic mast and coupling the panels to increase or decrease height to facilitate retraction and arrangement in a storage compartment located on the roof of the vehicle, so that the opening of the storage compartment and deployment or retraction of the device are controlled due to a dashboard of the vehicle.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a wind power device in deployed position.    Radial panels (3)    Pivot axles (5)    Rigid plates (7)    Body of rotor (9)    Vertical side bar (11)