The application relates to the technical field of textiles, and specifically discloses a method for processing polyester filaments. 35min to obtain the dried mixture; the dried mixture is melt-extruded, and filtered to obtain the extruded polyester filaments; the extruded polyester filaments are distributed, spun, cooled, post-treated and dried , after winding, polyester filament is obtained; polyester filament is made of raw materials comprising the following parts by weight: 70-90 parts of polyester chips, 0.6-1 part of accelerator, 2-6 parts of blue carbon powder, 3-8 parts of zeolite powder parts, 0.5-2 parts of fly ash, and 0.8-1.5 parts of polyvinylpyrrolidone; the polyester filament obtained by the method of the present application has the advantage of good air permeability.