Seaweed is an important marine resource,which is widely used in food,health products,marine biomaterials,industrial raw materials,agriculture and many other fields.The seaweed fertilizer prepared by enzymatic hydrolysis is a new type of high-efficiency and high-efficiency fertilizer with pure natural seaweed extract as the core additive,combined with the necessary nutrient elements for crop growth,and has the functions of nutrition,conditioning and so on.It is the first choice for the production of green food,which can increase crop yield and improve crop quality.Therefore,using seaweed to produce organic fertilizer is an important trend in fertilizer industry.