Since the first reaction involved ylides was reported, they have been an important research direction of organic chemistry.Among them, iodonium ylides attracted considerable attentions in organic synthesis due to their unique reactivities as both iodine source and ylides.The preparation methods and structural properties of iodonium ylides are generally elaborated.Then, the reactivities of iodonium ylides are reviewed in detal, including the application of iodonium ylides as a carbene precursor in insertion reactions, cyclopropane reactions, and their development research in cycloaddition reactions, rearrangement reactions and halogenation reaction.