The present invention relates to a fresh grass-fermented liquid fertilizer and a method for manufacturing a fresh grass-fermented liquid fertilizer that is produced by grinding fresh grass into fine particles, without any maturity, and naturally fermenting the fine particles through the cellulose in the fine particles as a substrate, thereby reducing the raw material cost of the fertilizer and the management cost and preventing the oxidization or destruction of various nutrients contained in organic matters. Further, the use of the fresh grass-fermented liquid fertilizer makes the soil activated, allows the growth of the plants to be accelerated, prevents all damages from disease and harmful insects, and treats all amount of fresh grass collected, without having secondary waste.