Hot carrier energy loss is one of major loss channels of solar cell efficiency loss. In recent years, the hot carrier effect in perovskites has received extensive attention from researchers. Compared with traditional semiconductor materials, perovskite has a slower hot carrier cooling process. It is expected to use these hot carriers to improve the energy conversion efficiency of solar cells and overcome the Shockley-Queisser limit of single-junction solar cells. In this paper, recent photophysical findings on slowed hot carriers in varied perovskites are reviewed. The ultrafast cooling dynamics and related measurement techniques are summarized, with discussion of underlying slowed hot carrier cooling mechanisms. The transport and extraction of hot carrier in perovskite are highlighted. Engineering of hot-carrier cooling properties and prospects for perovskite hot-carrier solar cells are also presented.