Jiejing seaweed fertilizer is a new type of green biological water-soluble fertilizer made from marine plant seaweed. Seaweed fertilizer has obvious effects on remediation of contaminated soil and improvement of soil deterioration. The polysaccharide, polyphenol, algal microorganism and algal fiber contained in it can repair soil structure, increase soil air permeability and water retention, and effectively solve the problems of soil salinization and soil hardening after application.