Amid the wave of transition toward greener and more efficient engineering construction, plastic steel sheet piles—as a new type of composite material component—are reshaping traditional engineering paradigms through their multiple advantages. This innovative building material, extruded from eco-friendly polymer materials, stands out for its core characteristics of “lightweight yet high strength, and ecological sustainability,” making it a rising star in water conservancy, municipal, and infrastructure sectors. The performance advantages of plastic-steel sheet piles are particularly outstanding. Weighing only one-eighth of traditional steel sheet piles, they significantly reduce transportation costs. Installation is as simple as assembling building blocks, achieving construction efficiency over five times faster than conventional methods. Mechanically, they boast a tensile strength of 48 MPa and compressive strength of 75 MPa. Even in harsh conditions like low temperatures and seawater corrosion, they maintain stable toughness with a service life exceeding 50 years. Most commendable is their ecological value: pre-reserved ecological holes in the piles not only nurture plants but also provide habitats for fish and shrimp, achieving a win-win for engineering protection and ecological restoration.