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In this work, magnetic lignin-based nanoparticles (M/ALFe) were developed and used to adsorb phosphorus to obtain phosphorus-saturated nanoparticles (M/ALFeP). The nanoparticles were then used as renewable slow-release compound fertilizers. First, aminated lignin was synthesized via Mannich reaction, and then Fe3O4 nanoparticles were loaded and Fe3+ was chelated on the aminated lignin to prepare M/ALFe. Finally, M/ALFeP were obtained after adsorption of phosphorus. The effects of nanoparticle dosage, solution pH and adsorption time on