The utility model relates to the technical field of car dumper, in particular to a four-connecting-rod hydraulic car leaning device of an open and concentrated dual-purpose car dumper, which comprises a longitudinal beam, at least one pair of upper bases, connecting rods, a lower base, a
hydraulic cylinder and a car leaning plate, two connecting rods and one lower base are arranged below each upper base; the connecting rod is hinged between the upper base and the lower base to form a
parallelogram hinge mechanism; according to the four-connecting-rod hydraulic car leaning device of the open-collecting dual-purpose car dumper, the movement deviation is reduced by designing a
parallelogram hinge mechanism, it is guaranteed that a car leaning plate is always in a vertical state in the extending and retracting processes, the
contact pressure between a car leaning face and a
carriage is evenly distributed, the
carriage is not prone to deformation, and the car leaning face is not prone to deformation. The problems that a
backup plate of an existing vehicle leaning device is prone to inclining, and local deformation of a compartment is prone to being caused are solved.