An organic fertilizer composition which can be used as organic compost, and a method for preparing the composition. The organic fertilizer composition can be used as compost alone or together with well-known compost. The organic fertilizer composition is prepared by: a culturing step of mixing either grape sugar, starch syrup, brown sugar, or molasses, or a mixture thereof with plant leaves selected from among those of grass, vegetables, or herbs, or a mixture thereof, adding salt to the resultant mixture to obtain a first fermented mixture, and culturing the first fermented mixture at a temperature of 20 to 60° C. for 24 hours to 1 year； a propagation step of mixing together the first fermented mixture, water, and either grape sugar, starch syrup, brown sugar, or molasses, or a mixture thereof, adding salt to the resultant mixture to obtain a second fermented mixture, and propagating the second fermented mixture at a temperature of 20 to 40° C.； and a mass propagation step of mixing together the second fermented mixture, water, and either grape sugar, starch syrup, brown sugar, or molasses, or a mixture thereof, adding salt to the resultant mixture to obtain a third fermented mixture, and mass-propagating the third fermented mixture at a temperature of 20 to 40° C. for 1 to 12 hours, wherein said mass propagation step is optional. The organic fertilizer composition can be variously used as animal feed, a soil conditioner, a water quality improvement agent, livestock feed, a malodor scavenger, etc.本発明は、有機堆肥として用いることができる有機質発酵組成物及びその製造方法に関するもので、植物の葉を単独又は１種以上混合したものに、糖分を混合した後、塩を添加した第１発酵混合物を２０ないし６０℃で２４時間ないし１年間培養する培養ステップ、前記第１発酵混合物に、水、及び糖分を混合したものに塩を添加して得られる第２発酵混合物を２０ないし４０℃で３０分ないし２４時間増殖する増殖ステップ、及び前記第２発酵混合物に、水、及び糖類を混合し、これに塩を添加して得られる第３発酵混合物を２０ないし４０℃で１ないし１２時間大量増殖することで、必要に応じて省略することのできる大量増殖ステップによって製造される。【代表図】図１
