The invention provides a polyester wastewater treatment method which comprises the following steps: enabling polyester wastewater to pass through a rectifying tower so as to obtain acetaldehyde gas on the top of the tower, and condensing so as to obtain an acetaldehyde liquid; or carrying out gas stripping and heavy component separation on the polyester wastewater before the polyester wastewater enters into the acetaldehyde rectifying tower, wherein the gas stripping refers to the fact that the polyester production wastewater enters into a gas stripping tower for gas stripping treatment, the obtained gas stripping waste liquid enters into a heavy component separation tower from the top of the gas stripping tower; and the heavy component separation refers to the fact that after the gas stripping waste liquid enters into the heavy component separation tower, a glycol aqueous solution is collected at the bottom of the heavy component separation tower, the waste gas on the top of the tower is collected so as to obtain the wastewater, and then the wastewater enters into the acetaldehyde rectifying tower.