The invention relates to a portable vehicle washing device. The portable vehicle washing device specifically comprises a box body, a telescopic hand pull rod, a storage box body, a water storage box body, box opening switches, a water pipe joint, an air valve, casters and a hand-held lifting handle; the telescopic hand pull rod is mounted on the rear side of the box body; the casters are mounted at the bottom end of the box body; the hand-held lifting handle is mounted on the right side of the box body; the storage box body is mounted on a left box of the box body; the box opening switch is mounted at the right upper corner of the storage box body; the water storage box body is mounted on a right box of the box body; the box opening switch is mounted at the left upper corner of the water storage box body; the air valve is mounted on the left side of the lower end of the water storage box body; and the water pipe joint is mounted on the right side of the lower end of the water storage box body. The portable vehicle washing device is simple to operate, convenient to carry and space-saving.