Rocket propellant is an essential part of weapons systems whose raw materials are largely composed of alpha-cellulose. These chemical compounds can be obtained in a variety of plants and animals, including kapok plants. The objective of this study was to explore the alpha cellulose derived from kapok fruit with a purity level above 90% and meets the qualification as a rocket propellant. Extraction, digestion, and purification were performed to know the presence of alpha cellulose and its quantity. Type Expert MPDn of Philips X-ray diffractometer device according to Indonesian Industrial Standard (SII) was used I this study. Based on the result, it was known that the yield amount of 100 g sample extraction was 28,20g-48,57g with kappa number of 23,63-28,17. The purity level of alpha cellulose and100 g yield of samples obtained was 90.00%-96.89% with the yield of 26.19g-46.67g. The identification of alpha-cellulose in the fiber, center, and peel of kapok fruitmet the specifications as a raw material for propellant and met the standards to support the defence industry to produce nitrocellulose as the main material of rocket propellant.