The utility model relates to a protective cover of a saloon car, which mainly comprises a protective cover body of the saloon car, a covering fixer and a quadrate body-connecting rain-proof bag (5), wherein the protective cover body has 3 layers of plus materials, the upper layer and the lower layer are rain-proof cloth layers, and the interlayer (3) in the middle is the fire-proof cloth layer which is made of aluminum foil. The covering fixer is sewn with a flexible rubber belt (4) with a circular cross section, and the flexible rubber belt is arranged on the interstitial sites corresponding to a car door, an engine cover and a rearing box cover on the periphery of the protective cover of the saloon car. The utility model which has the advantages of reasonable design, simple and novel structure, convenient use, portability and favorable practicability, and is suitable for popularization and application can be used on various saloon cars, pick-up trucks and SUV cars.