A method by which a terminal transmits a discovery signal for device-to-device communication in a wireless communication system is disclosed in the present application. Particularly, the method comprises the steps of: receiving one or more downlink signals; determining transmission power for transmitting the discovery signal on the basis of reference reception power of the one or more downlink signals; and transmitting the discovery signal on the basis of the determined transmission power, wherein the transmission power decreases as the reference reception power increases.