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This research aims to know the waste cassava peels is cleaned for glucose levels that will be used as raw material for fermentation process through bioethanol. Cassava peels contain lignosellulosic which consist of 43% cellulose, 38% hemicellulose, and 19% lignin. This research process is done in two stages, namely the process of pretreatment/delignification and hydrolysis. Delignification is done by making use of Aspergillus fumigatusi in Potato Dextrose Broth medium and performed a cassava peels is cleaned up to size 40 mesh. Pretreatment uses the variation comparison of fungi against raw material of 1:1, 1:3, 1:5 and the contact time of 1, 3, and 5 days. The analysis stage pretreatment using Chesson method. Phase hydrolysis sulfuric acid (H2SO4) 1% and heated at a temperature of 100oC for 2 hours. The analysis phase hydrolysis using DNS method to get sugar levels. In this study, obtained the best levels of lignin after pretreatment is by 8% and the research proves that cassava peels delignification retrieved from enzymatics activity of Aspergillus fumigatus and produces 10% of the total sugar samples is used. Further research needs to be done to increase sugar levels from raw cassava peels.