A flame retardant cationic dye dyeable copolyester polymer is provided to ensure excellent dyeability to CATIONIC DYE and flame retardancy at the same time, and to realize excellent two-tone effect in case of being mixed with the fire retardant characteristic polyester yarn. A flame retardant cationic dye dyeable copolyester polymer comprises a metal sulfonate-containing compound of the chemical formula (1) 0.5~3 mole % based on the carboxylic acid moiety of the whole polymeric composition; and a phosphate-based flame retardant of the chemical formula (2) 500~50000 ppm on the basis of the phosphorous atom. In the chemical formula 1, M shows the alkali metal. In the chemical formula 2, , R^1, R^2, and R^3 show a hydrogen residue, a phenyl group and C1~C7 alkyl group.
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