NOVELTY - Preparing seaweed extract, involves (a) soaking seaweeds in acid solution, and homogenizing materials, (b) mixing homogenized seaweed, distilled water, cellulase and pectinase, and performing digestion, (c) cooling and filtering digested mixture, washing filter residue, combining liquid obtained during washing of the residue and filtrate, centrifuging product, and collecting supernatant, (d) processing supernatant, (e) concentrating obtained product, and (f) inoculating microbial strains, and performing fermentation to obtain product.    USE - The method is useful for preparing seaweed extract which is used as foliar fertilizer (claimed).    ADVANTAGE - The method prepares seaweed extract that directly provides auxin, cytokinin, gibberellin, free amino acids, peptides, vitamins, flavone compound and terpene compound.    DETAILED DESCRIPTION - Method for preparing seaweed extract, involves (a) selecting healthy seaweeds, soaking the seaweeds in dilute acid solution having pH of 2-4, and homogenizing the materials, (b) uniformly mixing homogenized seaweed, distilled water, cellulase and pectinase in a mass ratio of 1:5-8:0.01-0.03:0.01-0.03, placing mixture in water bath at 40-50 degrees C for 2-4 hours, increasing the temperature of the mixture to 80 degrees C, and performing digestion for 30-60 minutes, (c) cooling and filtering digested mixture, washing filter residue twice using water, combining liquid obtained during washing of the residue and obtained filtrate, centrifuging combined product at a speed of 5000 revolutions/minute for 15-20 minutes, and collecting supernatant, (d) ultrasonically processing the supernatant under powder of 150-250 W for 15-20 minutes, (e) concentrating obtained product under reduced pressure until volume of the product is reduced to one-fourth or one-fifth of original volume, and adding base to obtained concentrate to regulate pH of the concentrate to 5-7, and (f) inoculating 5-7% microbial strains onto the concentrate, and performing fermentation to obtain product.