In Vietnam, every year hundreds of thousands of tons of jackfruit were harvested. A large part of the jackfruit, such as pulp, peel and seeds is unused and discarded, polluting the environment. This study aims to reuse this potential biomass to produce new advanced materials-carbon aerogel. Carbon aerogel from jackfruit waste was synthesized via hydrothermal method combined with the freeze-drying technique and followed by carbonization in nitrogen. Specific surface area, pore size, thermal properties of carbon aerogel were determined by Brunauer-Emmett-Teller (BET), TGA/DSC analysis, while the functional groups and were considered by FTIR. Synthesized carbon aerogel with low density (0.035 - 0.048 g/cm3), high porosity (95 - 98 %), specific surface area of 495.8 - 712.3 m2.g-1 and pore size 2.8 - 4.2 nm was then utilized as a component to prepare CDI electrodes. The results of desalination experiment confirmed that carbon aerogel electrodes have a good NaCl-removal capacity in low initial concentration.