A method for transmitting an uplink control channel in a wireless communication system and a device therefor are disclosed. In detail, the method performed by a user equipment (UE) includes generating a third sequence by aggregating a first sequence with a second sequence, generating a fourth sequence by using the generated third sequence and a specific cyclic shift index corresponding to specific uplink control information, and transmitting the uplink control channel by using the generated fourth sequence, wherein the fourth sequence may be transmitted in at least one symbol constituting a resource region allocated for transmission of the uplink control channel, and wherein the fourth sequence may indicate the specific uplink control information transmitted through the uplink control channel.