The river sand excavated from the tidal section exhibits an excessive fineness modulus, as well as elevated levels of chloride ion and mud content. This poses significant safety risks to the quality of product sand and self-use projects involving sand. To enhance production efficiency in the sand washing process and optimize the quality of product sand, our research team established a ratio table for fine sand through theoretical calculations, laboratory tests, and field debugging to regulate the fineness modulus of sand. Additionally, we created a turbidity-mud content plot for rapid determination of product sand quality, reducing time consumption by 95% compared to traditional methods. Furthermore, a control test was designed to validate the impact of PAM tail water recycling on the quality of sand and gravel. Compared with traditional methods, our holistic environmental-friendly approach to sand washing is more scientifically rigorous and efficient while demonstrating better relevance and applicability to riverine excavation in tidal reaches.