The present invention relates to a method for preparing a fermented Kimchi broth and a fermented broth prepared thereby wherein a first fermented Kimchi broth is prepared by adding sugar, sun-dried salt and water to Kimchi which is a main ingredient and wherein a fermented Kimchi broth is prepared by adding a plant extract to the first Kimchi broth and wherein the fermented Kimchi broth contains a plenty of microorganisms beneficial to a human body. In the present invention, a first fermented Kimchi broth is prepared by selecting and cutting well ripened Kimchi which is made by a conventional method; preparing a Kimchi mixture by adding sugar, sun-dried salt and water to the prepared Kimchi; putting the Kimchi mixture in a sealed container and fermenting at room temperature; and separating a liquid from the Kimchi mixture. A plant extract is prepared by adding water to a dried plant to prepare a first extract; adding water to the first dried plant extract to prepare a second extract at a temperature of 50 to 100°;C; and adding water to the second dried plant extract to prepare a third extract at a temperature of 100 to 130°;C. A fermented Kimchi broth is prepared by adding the first fermented Kimchi broth and the plant extract and fermenting the same. The method for preparing a fermented Kimchi broth according to the present invention enables fermentation in a short period of time effectively by using nutrient-rich Kimchi ingredients and sugar; enables production of a variety of fermented beverages containing a plenty of useful microorganisms contained in Kimchi without a process of inoculating lactic acid bacteria or adding microorganisms; and is beneficial to health by supplementation of plant nutrients of various kinds since a plant extract is mixed for fermentation.본 발명은 김치를 주재료로 하여 당분, 천일염, 물을 혼합하여 발효한 1차 김치발효액에 식물추출액을 추가하여 혼합 발효시킴으로써 인체에 유익한 미생물을 다량 함유하는 김치 발효액을 제조하는 방법 및 그 방법에 의해 제조되는 발효액에 관한 것으로, 본 발명은 통상의 방법으로 담은 숙성된 김치를 선별하여 절단하고, 당분, 천일염, 물을 혼합하여 김치