The present specification provides a method for performing an integrated access and backhaul (IAB) operation by an IAB node in a wireless communication system, and an apparatus therefor, the method comprising: performing an initial access operation with another node; receiving uplink reception timing information of a child IAB node of the IAB node from the other node; and performing the IAB operation on the basis of the uplink reception timing information, wherein the uplink reception timing information is information related to whether a distributed unit (DU) operation of the child IAB node and a mobile terminal (MT) operation of the child IAB node can be simultaneously performed with respect to at least one time resource.