Inorganic hydrated salt phase change composites have attracted increasing attention over the world because of their excellent thermodynamic properties and abundant reserves. As one kind of important low-temperature phase change materials, they are widely adopted to prepare room temperature composite phase change materials, which display a promising prospect and in line with the low-carbon energy-saving policies. The characteristics and progresses of typical types of porous carrier-supported inorganic hydrated salt phase change composites have been reviewed here. Moreover, the shortages and challenges of the inorganic hydrated salts are revealed, and the future research directions are also discussed.