NOVELTY - A multi-section tower type sewage treatment method comprises carrying out denitrification to crude water in oxygen-poor section of tower, and controlling internal reflowing amount; controlling the dissolved oxygen (DO) concentration in aerobic section within 2-4 mg/L, and the temperature at 20-30 degrees C to carry out nitration; controlling the reflux ratio within 50-60%; controlling the flow rate of liquid flowing among the towers; and discharging the slurry deposited on slurry depositing areas in the bottoms of the towers.    USE - Method for multi-section tower type sewage treatment.    ADVANTAGE - The method is capable of treating large amount of sewage, and has low investment and operation cost, simple operation and low space occupation.    DETAILED DESCRIPTION - A multi-section tower type sewage treatment method comprises using a treatment device comprising a tower body having an upper hollow section shell and a lower hollow section shell; and connection pipe mounted between two towers. The upper opening of connection pipe communicates with the upper section of former tower, and the lower opening with the lower section of the next tower. The bottom of every tower is equipped with a water distribution mechanism with control valves that are connected with a water inflow pipe. The upper part of last tower is equipped with a clean water outflow pipe. The middle part of every tower is equipped with an aeration mechanism with control valves that are connected with aeration pipe, which is connected with a blower. The top of every tower is equipped with an exhaust hole, and the side with an internal reflowing pipe having a control valve. The upper opening of the internal reflowing pipe is connected with the upper section of the tower, and the lower opening with the lower section. The bottom of every tower is equipped with a slurry discharge hole that is connected with a branched slurry discharge pipe having a control valve. The branched slurry discharge pipes are connected with a slurry discharge pipe. Fiber fillers with bio-membranes are mounted on the upper and lower ends in every tower. The method includes using the blower, the aeration pipes and the aeration mechanism to aerate; using a pump to let crude water flow into the device through the tower bottom at the same time; carrying out denitrification to the crude water in oxygen-poor section of the tower, and controlling the internal reflowing amount so that the dissolved oxygen (DO) concentration in the oxygen-poor section is less than or equal to 0.2 mg/L, the value of biological oxygen demand (BOD5)/nitrogen oxide (NOx)-N is more than 4, the pH is 6.5-7.5, and the temperature is 20-40 degrees C; controlling the DO concentration in the aerobic section within 2-4 mg/L, and the temperature at 20-30 degrees C, so as to carry out nitration; controlling the reflux ratio within 50-60% through the control valves on the internal reflowing pipes; controlling the flow rate of the liquid flowing among the towers and controlling the hydraulic detention time within 6-10 hours; and discharging the slurry deposited on the slurry depositing areas in the bottoms of the towers through the slurry pumps, the branched slurry discharge pipes and the slurry discharge pipe via the slurry discharge valves.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of multi-section tower type sewage treatment system.