Tofu liquid waste contains organic substances such as carbohydrates, proteins and fats, which can be used as organic liquid fertilizer. These substances must be broken down into small elements by fermentation process so it can be absorbed by plants. The purpose of this study was to determine the most optimum duration of fermentation, and also the variation of EM4 additional in starter of banana peels and cabbage or according to the requirements of Permentan No. 70/2011. The ratio of EM4 with filtrate of banana peels and cabbage that used is 10 ml /100 ml; 20 ml /100 ml; 30 ml /100 ml; 40 ml /100 ml and 50 ml /100 ml. The volume of tofu liquid waste used is 500 ml for each EM4 / Starter ratio. Fermentation carried out anaerobically for 4 hours; 5 days; 10 days and 15 days. The Nitrogen, P 2 O 5 and K 2 O of organic liquid fertilize was analyzed. The optimum result was obtained in the 10 days fermentation duration process with ratio of 40 ml / 100 ml (EM4 / Starter). Nitrogen, P 2 O 5 and K 2 O are obtained about 1.24%; 1.01% and 3.36% respectively.