Seaweed organic fertilizer is produced by seaweed residue(cellulose powder) with biological fermentation technology. The seaweed cellulose powder got a biodegradation to be micromolecule oligosaccharide absorbed by plant root easily after an advanced fermentation technology. Meanwhile, the beneficial bacterium produced much more metabolite effective against pathogens infection to protect plant root in the fermentation processing. Also this product is abundant of dissociative amino acid、algal peptide 、polyphenol、vitamin A、vitamin B1、B2、B3、niacin、folic acid、some seaweed mineral elements(P、S、K、Ca、Mg、I and so on)、some plant growth regulates(IAA、GA、cytokinin and so on)