NOVELTY - Processing organic waste, comprises decomposing organic waste by introducing organic waste into a first organic waste decomposition tank impregnated with marine microorganisms and a second organic waste decomposition tank impregnated with marine protozoa, culturing marine protozoa by supplying marine microorganisms, harvesting by separating marine protozoa from marine protozoa culture tank and second organic waste decomposition tank, and re-injecting residual organic waste into first organic waste decomposition tank.    USE - The method is useful for processing organic waste (claimed).    ADVANTAGE - The method is economical, avoids environmental contamination, and produces biomass within a short period of time.    DETAILED DESCRIPTION - Processing organic waste, comprises (a) decomposing the organic waste by introducing the organic waste into a first organic waste decomposition tank impregnated with marine microorganisms and a second organic waste decomposition tank impregnated with marine protozoa, (b) culturing marine protozoa by supplying marine microorganisms as food breeded while consuming the organic waste into a marine protozoa culture tank from the first organic waste decomposition tank, and (c) harvesting by separating marine protozoa from the marine protozoa culture tank and the second organic waste decomposition tank, and re-injecting the residual organic waste into the first organic waste decomposition tank. An INDEPENDENT CLAIM is also included for organic waste processing device, comprising the first organic waste decomposition tank for storing organic wastes and marine microorganisms and decomposing the organic waste by the marine microorganisms, the second organic waste decomposition tank for storing organic waste and marine protozoa and decomposing the organic waste by the marine protozoa, the marine protozoa culture tank connected to the first organic waste decomposition tank for culturing marine protozoa by supplying marine microorganisms as food, and a re-injection port connected to the first organic waste decomposition tank for harvesting by separating the marine protozoa from the second organic waste decomposition tank and re-injecting the residual organic waste.