The present invention relates to a process for the purification of Sucralose of formula (I) which comprises acetylation of substantially impure Sucralose to its penultimate intermediate 4,1',6'-trichloro-4,1',6'-trideoxy galactosucrose penta-acetate (TOPSA) of formula (VI) followed by purification of TOPSA and then deacetylation of purified TOPSA.