Chemical waste liquid purification treatment device

The invention belongs to the technical field of wastewater treatment equipment, and particularly relates to a chemical waste liquid purification treatment device. A first liquid conveying pipe is arranged on a settling tank, a first filter screen is arranged inside the settling tank, a first liquid level meter is arranged on the inner wall of the settling tank between the first filter screen and the first liquid conveying pipe, and a controller is arranged on the outer wall of the settling tank, a filter screen cleaning mechanism is arranged in the settling tank; a first purifying box is communicated with the settling tank through a second liquid conveying pipe, a horizontal hollow plate is arranged at the bottom of the purifying box, a plurality of longitudinally-arranged aeration pipes are arranged at the top of the purifying box, a hollow rotating shaft is arranged at the bottom of the horizontal hollow plate and connected with one end of a venturi tube in a sealed mode, the other end of the venturi tube i