The present invention relates to a wireless communication system, and more particularly, to a method and a device for cancelling a device trigger. The method for cancelling a device trigger in a wireless communication system, according to one embodiment of the present invention, can comprise the steps of: receiving a cancellation request for a first trigger message in a network node; and transmitting a second trigger message to the terminal if the first trigger message has been transmitted to the terminal and the cancellation request indicates a replacement request. The second trigger message can include information which indicates that the cancellation of the first trigger message has been requested.