Abstract: This invention relates to a car device for preventing flood damage, it uses the material of better ductility, wear resistant and waterproof to manufacture the cover which divided into upper and lower parts corresponded each other, wherein several airbag rooms are formed by gluing on each side edge with machine; before gluing with machine, an airbag is set in each airbag room, and each airbag room is dense impervious, an air inlet of each airbag is protruding out of the cover, so thus the joint of the air inlet and the cover is also dense impervious; for example, put the cover under a car and set the air through the air inlet to the airbag to inflate the cover and keep the car in high location, thus when the flood comes, the car can float on the water and avoid flood damage.