The invention relates to a method for preparing a terylene environmental protection type dyeing carrier, which comprises the following steps: (1) alkylamine, dimethylformamide, phthalic anhydride and triethylamine are added into a three-neck flask with the volume of 500mL under the condition of ice bath and are subject to thermal insulation reaction for one hour; then the temperature is increasedto 120 DEG C to perform a reflux reaction for four hours; the mixture is dumped into ice water after the reaction is finished; and white crystals are precipitated; (2) according to the mass proportion of 4 to 1, a carrier precursor is added into an emulsifying agent, heated and stirred; and (3) the process formulation is a dispersion dye, 1 to 3 percent owf of carrier, and 0.3g to 0.5g.L<-1> of glacial acetic acid; the bath ratio is 1 to 20; the dyeing temperature is between 85 and 100 DEG C; the thermal insulation time is between 60 and 100 minutes; and the dyeing carrier is washed and aired. The method is suitable for terylene boiling dyeing processes of dyeing and finishing plants, can reduce production cost, and shorten dyeing period. The textile after the dyeing has bright color, pure chromatic light, high brightness, no toxicity, no smell, and low COD value, so the dyeing carrier is an environment-frinedly green auxiliary.