Glycolysis　is　one　of　the　most　promising　closed-loop　recycling　technologies　for　PET　textiles;　however,　its　efficiency　is　compromised　by　the　presence　of　dyes,　which　inhibit　the　repolymerization　of　the　depolymerized　monomer,　bis(hydroxyethylterephthalate)　(BHET),　into　high-quality　recycled　PET　(rPET).　In　this　study,　hydrophobic　deep　eutectic　solvents　(DES)　were　employed　as　extractants　to　remove　colored　impurities　from　the　glycolysis　solution　(GS)　of　PET　glycolysis.　An　optimized　DES　system　composed　of　oleic　acid　and　menthol　(Men:OleA)　achieved　a　decolorization　ratio　of　up　to　89.4　%　in　a　simulated　GS　with　Disperse　Blue　56　doped　BHET　(BHET-DB56).　Kinetic　analysis　revealed　that　the　dye　extraction　by　Men:OleA　DES　follows　a　pseudo-second-order　kinetic　model.　Furthermore,　DES　successfully　decolorized　nine　different　colored　PET　textile　GSs,　achieving　a　maximum　decolorization　rate　of　98.2　%　after　a　secondary　extraction　process.　Even　after　multiple　recycling　cycles,　Men:OleA　DES　maintained　consistent　decolorization　performance.　Through　characterization　and　quantum　chemical　calculations,　the　decolorization　process　was　found　to　be　driven　primarily　by　physical　interactions,　specifically　hydrogen　bonding　and　van　der　Waals　forces　between　dye　molecules　and　DES.　This　study　seeks　to　provide　an　effective　method　for　the　decolorization　of　BHET　and　proposes　a　strategy　for　the　closed-loop　recycling　of　colored　PET　textiles.