Abstract: A portable car-cleaning device, which comprises a cleaning brush and at least one water storage chamber with a water inlet, the at least one chamber being provided with at least one washing dewatering device that includes two oppositely disposed rollers, the cleaning brush being interposed between the two rollers for washing and dewatering. The car-cleaning device is simple in structure and convenient to carry, and convenient in washing and dewatering the cleaning brush, making a car washed faster, improving the washing efficiency.