The present disclosure provides a method for transmitting an uplink signal by a terminal in a wireless communication system. Specifically, the method comprises: receiving information related to the size of a unit bandwidth (BW) for listen-before-talk (LBT); obtaining an energy detection (ED) threshold and maximum output power associated with the unit bandwidth; performing the LBT on the basis of the unit bandwidth and the ED threshold; and transmitting an uplink signal on the basis of a result of the LBT and the maximum output power.