A dust cleaning device includes a tray, a cover assembled to the tray, and an air nozzle. The tray defines recesses for receiving lens barrels. A bottom of each of the recesses defines a through hole communicating with the lens barrel. The cover includes a main body and an inlet tube. The main body includes a top wall, a bottom wall, sidewalls, guide passages between the top and bottom walls, an inlet passage, and outlet passages. The inlet tube extends from the top wall. The guide passages criss-cross and communicate with each other. The sidewalls shield the guide passages. The inlet passage communicates with an inside of the inlet tube and one of the guide passages. The outlet passages communicate with the guide passages and are exposed at the bottom wall. The outlet passages are aligned with the respective recesses. The air nozzle is mounted in the inlet tube.