The invention discloses a repeater and a signal processing method thereof, and aims at reducing weight of the repeater, reducing the volume of the repeater and reducing power consumption of the repeater. The repeater comprises a back transmission antenna, an access antenna, a first link unit, a second link unit and a baseband integrated circuit. The first link unit comprises a first radio frequency front-end module and a first radio frequency integrated circuit. The back transmission antenna, the first radio frequency front-end module, the first radio frequency integrated circuit and the baseband integrated circuit are connected in turn via a signal link, and the baseband integrated circuit is also connected with the first radio frequency front-end module and the first radio frequency integrated circuit respectively via a control link. The second link unit comprises a second radio frequency front-end module and a second radio frequency integrated circuit. The access antenna, the second radio frequency front-end module, the second radio frequency integrated circuit and the baseband integrated circuit are connected in turn via the signal link, and the baseband integrated circuit is also connected with the second radio frequency front-end module and the second radio frequency integrated circuit respectively via the control link.