A hanging vehicle-mounted camera device, comprises: a support structure, including two hanging units and an installation crossbar; and an installation structure, including an installation frame for mounting a camera. The two hanging units are spaced apart in a transverse direction, each hanging unit comprising a hanging rod and two support rods installed at upper and lower ends of the hanging rod, the hanging rod extends in a vertical direction, the two support rods extend in a longitudinal direction, the upper support rod is adapted to cooperate with a deflector groove on an upper side of a vehicle door, the lower support rod is adapted to cooperate with an outer surface of the vehicle door, and a sliding seat is mounted on the installation crossbar for sliding movement in the transverse direction; and one end of the installation frame in the longitudinal direction is detachably mounted on the sliding seat.