An automatic multipurpose shield device for vehicles, comprising an extendible tubular-shaped structure mounted on cross bars of the roof rack through a rotatory base. Said extendible structure is composed of two parts: a main container body (a) and a secondary body (b), the latter located inside the main container body (a) during the resting state and connected by longitudinal rails. The extendible tubular structure has two pairs of shield rolls connected to a mechanism and attached to two pairs of projecting arms that allow the automatic extension thereof, covering the entire length of the vehicle. The shield rolls may carry flexible solar cells or operate only to protect the vehicle against sun and hail.