The present specification discloses a method for transmitting and receiving a signal in a WLAN system, by a station, and a device therefor. More particularly, the present specification discloses, when a station transmits and receives a signal through a channel on which one or two channels are bonded, a method for constituting an enhanced directional multi gigabit (EDMG) short training field (STF) for an orthogonal frequency division multiplexing (OFDM) packet, and transmitting and receiving a signal comprising the constituted EDMG STF field, and a device therefor.