The invention relates to a treatment method for wastewater produced by recycled polyester. In the present invention, the recycled polyester production waste water enters the first chemical oxidation pool, and enters the first neutralization adjustment pool after chemical oxidation, the pH is adjusted to 6.5, dehydrated by the first centrifugal dehydrator, and passed through the anoxic pool-the first sedimentation tank-the second The first aerobic tank-the second sedimentation tank performs the first biochemical treatment, the second chemical oxidation tank performs chemical treatment, adjusts pH=4, removes part of COD, enters the second neutralization adjustment tank, adjusts the pH to 7.5, and passes through the second Centrifugal dehydrator dehydration, the second biochemical treatment through the second aerobic tank-the third sedimentation tank, enter the third chemical oxidation tank for chemical treatment, adjust pH = 4, enter the third neutralization adjustment tank, adjust the pH to 6 , and discharge after dehydration by the third centrifugal dehydrator. The invention overcomes the defects of high energy consumption and extremely high cost. The invention is friendly, and compared with the distillation method, the waste water treatment cost is low, the energy consumption is low, the COD removal rate is improved, and the problem that the dangerous mother liquor cannot be treated caused by the distillation method is avoided.