In the present invention a method for a terminal to report channel state information (CSI) in a wireless communication system is disclosed. More specifically, the method comprises: configuring a plurality of mini-slot sets that are included in slot N−k as a reference resource; and simultaneously reporting to a base station all CSI for the respective plurality of mini-slot sets that are generated based on the reference resource within slot N, wherein the plurality of mini-slot sets comprise a plurality of mini-slots, and wherein k is an integer that is configured by the base station.