A method for harnessing, recovering and utilizing ecological farm is carried out by centrifugalizing out
marsh slag and
marsh liquid from
marsh gas in
livestock and fowls farm, sterilizing for marsh liquid, filtering by water, selecting chlorellin
algae, expanding while culturing, raising fish and
algae, inspecting while preventing pest diseases, collecting, recovering clear liquor, utilizing by
livestock and fowls farm, extracting
algae mud from algae liquor, mixing with feed, returning farm for animals and fowls, inoculating while fermenting, mixing fermented algae bacterium nutritive liquid with feed for animals and fowls, or extracting algae mud from algae liquor, spraying and
drying to obtain algae
powder health-care food. It creates 'animals-fowls-marsh-fish-algae-bacterium' symbiotic food-chain circulation and ecological balance
system.