The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for transmitting a scheduling request in a wireless communication system, the method comprising: receiving mapping information of SR resource sets and logical channels from an eNB, wherein one of the SR resource sets is a set of uplink resources that is used for transmitting SR; triggering a SR by a data of a logical channel; and transmitting the triggered SR on the SR resource set associated with the logical channel based on the mapping information.