The invention discloses a vertical current hydraulic-drop aerating device which mainly comprises a water distributer, multiple stages of hydraulic-drop reoxygenation tanks, a catch basin and a bracket, wherein the water distributer, the multiple-stage hydraulic-drop reoxygenation tank and the catch basin are vertically fixed in the bracket from top to bottom in a three-dimensional mode; spaces among the multiple stages of hydraulic-drop reoxygenation tanks can be vertically freely regulated; the multiple stages of hydraulic-drop reoxygenation tanks are round or square, and the bottom in the tank is provided with a hydraulic-drop disk; the hydraulic-drop disk is provided with a gap; and the lower surface of the hydraulic-drop disk is provided with a waterstop ring. The device is suitable for domestic sewage anaerobic-artificial wetland treating technology, the anaerobic effluent dissolved oxygen concentration is improved, and the ammonia nitrogen and total nitrogen strainaway rate of the artificial wetland is improved. By aiming at the water body with a low dissolved oxygen concentration in the device, natural elevation is utilized, or the surplus life of the water pump is improved, the subsequent processing technology oxygen supply amount is increased, and the strengthened aerating energy consumption is lowered.