NOVELTY - Preparing selenium-enriched seaweed product, comprises (i) carrying out separation, and purification of seaweed by cleaning, and sterilizing the seaweed by soaking in a basic culture medium, homogenizing, to obtain seaweed cytoplasm, and inoculating seaweed cytoplasm into a culture medium, to obtain purified seaweed cells on a minimal media, and separating purified seaweed cell culture under sterile conditions, and placing the resulting cells into flasks-containing seaweed selenium-enriched liquid medium, culturing, and separating cells; and (ii) processing selenium-enriched seaweed cells.    USE - The product is useful as natural bio-materials, healthcare food products and beverages.    ADVANTAGE - The method produces product: which reduces health hazards, improves human and animal selenium absorption and utilization rate, meets the requirements of the human body, and exhibits antiviral activity; achieves rapid growth and reproduction of seaweed has; simple operation procedure; and is environmental friendly, economical, and suitable for industrial production.    DETAILED DESCRIPTION - Preparing selenium-enriched seaweed product, comprises (i) carrying out separation, and purification of seaweed by cleaning, and sterilizing the seaweed by soaking in a basic culture medium for 8-11 hours, homogenizing in a glass homogenizer, to obtain seaweed cytoplasm, and inoculating seaweed cytoplasm into a culture medium, to obtain purified seaweed cells on a minimal media, and separating the purified seaweed cell culture under sterile conditions, and placing the resulting cells into flasks-containing seaweed selenium-enriched liquid medium, and placing the flasks at 25 degrees C, illuminating under average light intensity of 2000 lux by placing in a biochemical incubator under constant temperature for 15-20 days, and culturing once in every 12 hours alternatively under light and dark conditions, filtering, and separating cells, namely selenium-enriched seaweed cells; and (ii) processing the selenium-enriched seaweed cells by washing the cells with distilled water, to remove extracellular polysaccharides and inorganic selenium from seaweed, and carrying out freeze-drying at -50 degrees C to -55 degrees C, to obtain the final product.