A motor vehicle protection system suitable for large-size cars such as sport utility vehicles (SUV), is disclosed. The protection system includes a cover sheet adapted to be anchored on a motor vehicle so as to cover the motor vehicle body which has a roof and two opposite sides, on each of which at least one window is present. The motor vehicle protection system cover sheet has at least one supplementary traction appendage having a first end constrained to the sheet and a second end adapted to be fixed through coupling means on the body so as to put in traction the portion of the sheet intended to cover the roof of the motor vehicle downwards. The supplementary traction appendage extends starting from the sheet so as to be interposed between the body and the sheet.