Polymer composite plastic steel sheet piles represent a new structural material emerging in response to green construction demands. Manufactured using polymer resin as the base material through reinforcement modification and specialized processes, they offer significant advantages including environmental friendliness, durability, lightweight properties, and high strength. This material is non-toxic and harmless during production and use, free from heavy metal contamination, making it suitable for sensitive areas such as ecological waterways and drinking water sources. It demonstrates outstanding resistance to acids, alkalis, corrosion, aging, and freeze-thaw cycles. When used outdoors long-term, it does not rust, rot, or crack, with a service life far exceeding that of traditional steel, wood, and ordinary concrete products. Additionally, polymer composite plastic steel sheet piles are lightweight yet high-strength, facilitating transportation, hoisting, and construction. This significantly reduces mechanical costs and construction complexity. Their interlocking structure provides a tight seal with excellent water-stopping performance, meeting diverse engineering requirements such as earth retention, slope protection, cofferdams, and foundation pit support. With their eco-friendly, durable, efficient installation, and low overall cost, polymer composite plastic steel sheet piles have become the preferred new material in water conservancy, municipal, ecological restoration, and landscape projects. They powerfully advance engineering construction toward low-carbon, long-lasting, and high-efficiency development.