The present invention is a portable collapsible car cover assembly which includes: (a) a collapsible hollow housing with exit sheet exit apertures, which housing has a compact collapsed configuration and an extended deployed configuration; (b) a base which includes a suction cup for fastening the assembly to the roof of a car; (c) which housing contains sheets of protective material wound around rollers when the car cover assembly is collapsed and stored, and wherein the sheets are unwound to cover the trunk, passenger compartment, and hood when the assembly is fully deployed; (d) several elements for attaching the distal end of the sheets of protective material to a car; and (e) at least two security lines for attaching the housing to the car as a theft deterrent.