Device for treating waste water of chemical engineering

The invention discloses a device for treating waste water of chemical engineering. The device comprises a precipitating tower, a reaction tower and a water discharging pipeline, wherein a waste-waterfeeding pipe is connected with one side of the top part of the precipitating tower; the precipitating tower is internally provided with a filtering net and an active-carbon adsorbing net from top to bottom; the filtering net and the active-carbon adsorbing net are respectively provided with a first cleaning hairbrush and a second cleaning hairbrush; the precipitating tower and the reaction tower are connected by the water discharging pipeline; a lifting pump is also arranged on the water discharging pipeline; a stirring device is arranged in the reaction tower; a filtering plate is also arranged at the middle-upper part of the reaction tower; a dosing tank is arranged at the top part of the reaction tower; a rotary motor for driving the stirring device to rotate is also arranged at the toppart of the reaction towe