Disclosed are a method and device for performing uplink or downlink transmission and reception in a wireless communication system. The method for performing uplink or downlink transmission and reception according to an embodiment disclosed herein comprises the steps in which a terminal: receives, from a base station, configuration information related to a plurality of CORESET pool candidates; receives, from the base station, first information for activating a first CORESET pool and a second CORESET pool among the plurality of CORESET pool candidates; and performs the uplink transmission or the downlink reception on the basis of at least one CORESET included in each of the first CORESET pool and the second CORESET pool, wherein the first CORESET pool may be related to a serving cell, and the second CORESET pool may be related to one of the serving cell or a non-serving cell.