The invention discloses a conversion waste water stripping tower waste water heat recovery method for use in the production of methanol by using coke oven gas, which mainly comprises that: waste water in a tower kettle in a conversion waste water stripping tower exchanges heat with waste water flowing into the stripping tower first and then exchange heat with feed of a methanol distillation pressure tower, desalted water required by the device and coarse methanol feed of a methanol pre-distillation tower; and after the heat is fully used, the waste water is cooled by circulating cooling waterand then discharged to a circulating water station or a desalted water station to be reused as raw water. If the waste water is discharged to the desalted water station as raw water, the temperature of waste water cooled by the circulating cooling water is controlled by the temperature of the raw water tank of the desalted water station.