Seaweed fertilizer is a kind of biological fertilizer, which is made of marine plant seaweed as the main raw material and processed scientifically. Its main components are the natural bioactive substances extracted from seaweed, which are beneficial to plant growth and development, and the mineral nutrient elements absorbed and enriched in the body by seaweed from the sea, including seaweed polysaccharide, phenol polymer,mannitol, betaine and plant growth regulating substances(Cytokinin, gibberellin, auxin, and abscisic acid) and nitrogen,phosphorus, potassium, and iron, boron, molybdenum, iodine and other trace elements. In addition, humic acid and trace elementswere added to increase the efficiency and chelation of fertilizer.