High-entropy ceramics are a novel class of ceramic materials， which have attracted extensive attention in recent years because of their unique structure and properties. In this review， the definition of high-entropy ceramics has been introduced and the preparation methods of high-entropy ceramics，such as solid-state reaction， precursor pyrolysis and spark plasma sintering， are summarized. The research progress of high-entropy ceramics， such as high-entropy oxides， high-entropy carbides and high-entropy diborides， are discussed in detail. Finally， the characteristics and application prospects of the high-entropy ceramics are summarized.