Car seat cover device provided with vibrating warning system for signaling the condition of the direction indicators, comprising: - a cover seat; - a support base integral with the upper surface of said seat cover; - a plurality of flat bases arranged on the right side and left side of said support base, each one of said flat bases being provided with at least a vibrating motor electrically connected to an electronic control unit; - an electronic control unit provided with a connector allowing its connection to the car control gearcase and configured to receive by the vehicle control gearcase the signal relating to the condition of the direction indicators, to operate as a function of said signal the vibrating motors associated to the flat bases arranged on the same side as the active direction indicator, thus generating vibrations which can be perceived by the driver sitting on said seat cover, and characterized in that at the perimeter of the upper surface of said support base a plurality of pressure sensors is provided, which are connected to said electronic control unit and each one configured to transmit to said electronic control unit a signal indicating the presence or not of the driver weight on a corresponding portion of the seat cover, and in that said control unit is configured to receive the signals sent by said pressure sensors, to associate to each signal the position of the respective pressure sensor and to activate, in case of activation of a direction indicator of the vehicle, only the vibrating motors associated to the flat bases arranged at the same side as the active direction indicator and positioned at least at a pressure sensor which is detecting the presence of weight on the corresponding position of the cover seat. - a cover seat; - a support base integral with the upper surface of said seat cover; - a plurality of flat bases arranged on the right side and left side of said support base, each one of said flat bases being provided with at least a vibrating motor electrically connected to an electronic control unit; - an electronic control unit provided with a connector allowing its connection to the car control gearcase and configured to receive by the vehicle control gearcase the signal relating to the condition of the direction indicators, to operate as a function of said signal the vibrating motors associated to the flat bases arranged on the same side as the active direction indicator, thus generating vibrations which can be perceived by the driver sitting on said seat cover, at the perimeter of the upper surface of said support base a plurality of pressure sensors is provided, which are connected to said electronic control unit and each one configured to transmit to said electronic control unit a signal indicating the presence or not of the driver weight on a corresponding portion of the seat cover, and in that said control unit is configured to receive the signals sent by said pressure sensors, to associate to each signal the position of the respective pressure sensor and to activate, in case of activation of a direction indicator of the vehicle, only the vibrating motors associated to the flat bases arranged at the same side as the active direction indicator and positioned at least at a pressure sensor which is detecting the presence of weight on the corresponding position of the cover seat.