The invention discloses an eco-friendly method for a prefabricated concrete trough type sheet pile. A pile body made from reinforced concrete is included. The cross section of the pile body is in a trough shape. The method is characterized in that alkalescent or devastating cement is used as a substrate of a material of the prefabricated concrete trough type sheet pile so that alkalinity of the sheet pile can be reduced; biological nesting holes are formed in a pile shaft of the sheet pile, and meanwhile bionic textures are formed in the portion, close to the water surface, of the pile shaft of the sheet pile, so that the biological nesting holes and the bionic textures provide the original ecology-similar living environment for aquatic animals and plants; the biological nesting holes are in a trapezoidal trough shape and are located in the inner walls of the pile body of the sheet pile; and the bionic textures are in a long and thin protruding bar shape, are located in the inner walls of the pile body of the sheet pile and are parallel to the length direction of the pile body. The problem that high-strength prefabricated sheet piles are greatly different from the original ecological environment is solved through multiple methods, and the ecological sheet pile is properly improved, so that the ecological environment approaches to the soil layer condition as much as possible after completion of construction of the sheet pile, the original ecological environment is maintained, and the existing ecological balance is preserved.