The present disclosure relates to a resource allocation method and device in a wireless communication system. A communication method of a transmission terminal in a wireless communication system supporting sidelink carrier aggregation, according to the present disclosure, comprises the steps of receiving, from a network, information on a resource pool for sidelink communication, and information on a sidelink feedback channel, transmitting sidelink data in a sidelink data channel through at least one carrier, and receiving, in the sidelink feedback channel through at least one carrier from at least one receiving terminal which has received the sidelink data, sidelink feedback information including acknowledgement information for the sidelink data.