A moisture-absorbing and wicking polyester Elastic Yarn having a cross-shaped cross section spun from a special-shaped spinneret. The cross-section profile is good, the wicking effect is excellent, and the product has excellent moisture wicking performance; The product has excellent physical properties, especially excellent dyeing performance. Widely used in sportswear fabrics and underwear fabrics, which is conducive to improving the comfort of clothing and solving the sultry characteristics of chemical fiber fabrics.