Superlubricity is a new area in tribology, in which the slide friction coefficient is about 1/1000 to 1/100 of the general ones. Since the concept of superlubricity was proposed, it has attracted more and more attentions from researchers in fields of tribology, physics, chemistry, materials, etc. Many significant progresses have been made during the last two decades in experimental studies on superlubricity. In the present work, the recent advancements in solid superlubricity and liquid superlubricity are reviewed and the lubricating mechanisms of different superlubricity systems are discussed. Finally, the problems on the superlubricity mechanism and the development of superlubricity in the future are addressed.