The invention discloses a road pavement dust settling system. More than one water collecting pipe is arranged in green belts on the two sides of a road in an embedded mode, all the water collecting pipes are arranged in parallel and are each provided with a water storage cavity, and a water inlet is formed in the outer end of each water storage cavity. A filtering meshed plate is arranged on the side face of each green belt, more than one filtering hole is formed in the middle of each filtering meshed plate, rainwater enters the water storage cavities from the filtering holes, the water inletends of the water storage cavities are sealed by the filtering meshed plates, and a water outlet device is arranged in each water storage cavity. Since the road pavement dust settling system is arranged in the green belts, drainage pressure of a drainage system when rain is heavy can be lowered, rainwater can be stored so as to be conveniently used for settling dust on a pavement in the later, notonly is the water accumulating problem caused by large rainwater amount of a road solved, but also the rainwater can be effectively applied to the road to reduce road dust, plants on the green beltscan be irrigated, and three purposes are achieved through the system.