Nutrient salt preparing and adding device for sewage treatment

The utility model discloses a nutritive salt preparing and feeding device for sewage treatment. The nutritive salt preparing and feeding device comprises a dosing box, a dosing pump and an aeration pipe, a water injection pipe is mounted on the dosing box, a liquid inlet pipe and a liquid outlet pipe are mounted on the dosing pump, a Y-shaped filter is mounted on the liquid inlet pipe to filter inlet liquid impurities, the liquid outlet pipe is divided into two branch pipes through a tee joint, one branch pipe is led into the anaerobic tank, the other branch pipe is led into the aerobic tank, and a control valve and a flow meter are mounted on the branch pipes to control flow. And a control valve is arranged on the aeration pipe to control the aeration rate so as to stir and uniformly mix the nutrient solution. The device realizes the function of accurately and quantitatively adding the nutritive salt in sewage treatment, improves the utilization rate of the nutritive salt, saves manpower, improves the treatm