The invention relates to a graded micro-mist filler humidifier, and belongs to the technical field of air humidification. The graded micro-mist filler humidifier comprises five parts, namely a water collecting chamber, a micro-mist humidifying area, a filler humidifying area, a gas-liquid rectifying area and an exhaust chamber from bottom to top; and during operation, a circulating water pump sends water in the water collecting chamber into water distribution pipes of the micro-mist humidifying area and the filler humidifying area respectively, the water is atomized by a micro-mist nozzle and a mechanical nozzle respectively and then jetted downwards, dry air enters from an air inlet pipeline at the bottom of a main body and passes through the micro-mist humidifying area, the filler humidifying area and the gas-liquid rectifying area, heat and mass exchange occurs between the air and the water, the relative humidity is increased, the water which is not evaporated completely finally enters the water collecting chamber to form water circulation, and the humidified air is exhausted from the exhaust chamber at the top. By means of the graded micro-mist filler humidifier, the relative humidity of an outlet of the humidifier can reach 95%, the humidifying efficiency is improved, and due to the existence of the filler, liquid drops can be effectively prevented from flowing out of the outlet of the humidifier along with airflow. The graded micro-mist filler humidifier is suitable for northern areas with low air humidity and the field of wastewater evaporation treatment.