A polyester fiber having an excellent shielding property and a manufacturing method thereof are provided to replace the presently used high-priced inflammable working fiber. The polyester fiber is weaved by means of a raw fiber ranged from 0.3 denier to 40 denier. The ratio of the long and short shafts in the raw fiber is 1:1.5 to 1:5.0 and the raw fiber has an elliptic section or a diamond-shaped section. The fiber is processed by the urethane coating or laminating coating. The fiber is also manufactured by the warp thread and the weft thread. The weft thread has also a circular section.
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