Phosphogypsum leachate is a liquid produced during phosphogypsum stacking. It has the characteristics of high phosphorus content, low pH, high corrosivity , and high concentrations of heavy metals. If it seeps into the ground over time, it will seriously pollute the groundwater and surface water and pose a significant threat to the surrounding basin environment and human health. In this study, a struvite precipitation method was proposed to recover phosphorus sources from phosphogypsum and its leachate to prepare valuable percolate-based struvite crystal (PSL-S). The core idea is to improve the recovery rate of valuable components by converting the raw mineral phase of phosphorus in the leachate , which enables the production of struvite using industrial solid waste instead of pure reagents, thereby solving two issues: the high price of struvite prepared by pure reagents and the substantial waste of valuable components in phosphogypsum leachate. The study involved three variables: Mg/P molar ratio, N/P molar ratio, and pH. Two indicators, namely, the phosphorus recovery rate in leachate and the purity of struvite from PSL-S, were selected. Through a combination of single-factor influence experiments and optimization orthogonal experiments, combined with phase analysis, the optimal conditions for the preparation of PSL-S were obtained, specifically, when the N/P molar ratio was 5∶1, the Mg/P molar ratio was 1.6∶1, and the pH value was 9.5 , with a phosphate recovery rate of 87.73% and a PSL-S preparation purity of 78.24%. The successful preparation of PSL-S enables the efficient resource utilization of phosphogypsum leachate, greatly reduces the production cost of struvite, and provides technical support for the resource utilization of phosphorus chemical waste.