The present specification provides a method for reporting aperiodic channel state information (ACSI) in a wireless communication system. More specifically, the method, which is performed by a terminal, comprises the steps of: receiving, from a base station, downlink control information (DCI) including a reporting trigger for each of first ACSI and second ACSI and a reporting timing for each of the first ACSI and the second ACSI; and transmitting low-priority ACSI, which is determined among the first ACSI and the second ACSI on the basis of a predetermined rule, to the base station at a reporting time point determined on the basis of a delayed reporting timing.