The core substance of seaweed fertilizer is pure natural seaweed extract. The main raw materials are selected from natural seaweed. After special biochemical treatment, the essence of the seaweed is extracted and the natural active ingredients are largely retained. Seaweed fertilizer contains a large amount of non-nitrogenous organic matter, more than 40 kinds of mineral elements and abundant vitamins, such as potassium, calcium, magnesium, zinc and iodine, which cannot be matched by land plants. It can stimulate the production of non-specific active factors in plants and regulate the balance of endogenous hormones.