The advantages and disadvantages of traditional air flotation and shallow air flotation were compared. The effect of shallow air flotation on acrylic fiber wastewater treatment was studied through the wastewater treatment project of a chemical fiber corporation in Jilin province. The results showed that, using shallow air flotation machine to pretreat acrylic fiber wastewater, the average removal rate of CODCr reached above 11.3%, which was over 50% higher than that by traditional rectangular tank air flotation machine(about 5.6%), which showed that, shallow air flotation had a good performance when treating acrylic fiber wastewater.