The present application discloses a method in which a terminal controls uplink timing in a wireless communication system. Specifically, the method is characterized by comprising: a step in which, if an uplink timing command for a specific uplink timing group is received from a network, a timer for the specific uplink timing group is started, said timer being the time available for the uplink timing command; a step in which a message for the discarding, from the network, of a serving cell included in the specific uplink timing group is received; and a step in which the timer is stopped if there is no serving cell included in the specific uplink timing group.