The utility model relates to an environment-friendly low-melting-point polyester fiber. The fiber comprises a regenerated polyester fiber (1), an environment-friendly primary polyester layer (3) is arranged on the outer side of the regenerated polyester fiber (1), an ammonium bicarbonate alcohol reduction layer (4) is arranged on the outer side of the environment-friendly primary polyester layer (3), and an octene polymerization layer (5) is arranged on the outer side of the ammonium bicarbonate alcohol reduction layer (4). According to the utility model, through the regenerated polyester fibers and the environment-friendly primary polyester layer, the ethanol content index in the product can be effectively reduced; the arranged ammonium bicarbonate alcohol reduction layer can further reduce the methanol content; the arranged octene polymerization layer can reduce the melting point of the fiber, and due to the research and development of the environment-friendly low-melting-point polyester fiber, the harm of the product to the human body is reduced, the body health of people is guaranteed, meanwhile, the additional value of the product is increased, and the enterprise competitiveness is enhanced.