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The study aimed to determine type natural zeolite from Malang East Java and the size of the activated natural zeolite as a catalyst as well as hydrolysis time on conversion cellulose to glucose that was assisted by ultrasound. Natural zeolite rock was crushed and sieved in the size of 50, 100, and 200 mesh. Zeolite was activated by means of heating at a temperature of 500 ℃ for 5 hours. The zeolite characterized using XRD and BET. Hydrolysis of cellulose using variation of mesh size and ultrasonication time. Hydrolysis results were measured using the Nelson-Somogyi test. The results showed that the type of natural zeolite from Malang East Java is a mordenite. Surface area of activated natural zeolite in the size of 50, 100, and 200 mesh respectively is 13.065, 99.096 and 27.081 m2/g. The highest yield of glucose obtained when it was used an activated natural zeolite in the size of 100 mesh and sonicated during 240 minutes. The highest yield of hydrolysis cellulose to glucose when it is used natural zeolite catalysts active with a size of 100 mesh that is 12.69%.