The present invention relates to a high-strength, high-extension polyester fiber to be used for anchoring, mooring, or towing a ship, and more particularly, to a polyester fiber having an elastic recovery percentage of 70% or higher at 10% deformation at the maximum load measured at room temperature, an elastic recovery percentage of 50% or higher at 20% deformation at the maximum load, and an elastic recovery percentage of 40% or higher at 30% deformation at the maximum load.
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