The present invention relates to a method and a device for controlling a relay of relay user equipment (UE) in a wireless communication system. Specifically, the method comprises the steps of: announcing information on whether the relay UE can be relayed; and controlling the relay by comparing updated information with reference information according to a new relay request, wherein the reference information is set to be changed on the basis of state information of the relay UE and/or a packet data network (PDN) connection related to the relay.