An apparatus for processing a downlink signal, applied to a downlink of a base station, comprising a baseband signal differentiating unit, a public carrier module, a traffic carrier module, a public power amplifier unit, and a traffic power amplifier unit, wherein: the baseband signal differentiating unit is connected to a baseband processing unit of the downlink of the base station, and is configured to receive a baseband signal transmitted by baseband processing unit, and differentiate if the received baseband signal is a public baseband signal or a traffic baseband signal; the public carrier unit is connected to the baseband signal differentiating unit, and is further configured to receive a public baseband signal obtained by the baseband signal differentiating unit by means of differentiation, perform up-conversion and digital-to-analog DA conversion on the public baseband signal to obtain a public carrier signal, and transmit the public carrier signal to the public power amplifier unit; the traffic carrier module is connected to the baseband signal differentiating unit, and is further configured to receive a traffic baseband signal obtained by the baseband signal differentiating unit by means of differentiation, perform up-conversion and digital-to-analog DA conversion on the traffic baseband signal to obtain a traffic carrier signal, and transmit the traffic carrier signal to the traffic power amplifier unit; the public power amplifier unit is connected to the public carrier module, and is configured to receive the public carrier signal transmitted by the public carrier module, and output a public output signal after amplifying power of the public carrier signal; and the traffic power amplifier unit is connected to the traffic carrier module, and is configured to receive the traffic carrier signal transmitted by the traffic carrier module, and output a traffic output signal after amplifying power of the traffic carrier signal; characterized in that, the traffic power amplifier unit is further configured to be disabled in a case where there is no traffic signal or there is low traffic volume enabling the base station to disconnect or hibernate a transmission link of the traffic signal. the baseband signal differentiating unit is connected to a baseband processing unit of the downlink of the base station, and is configured to receive a baseband signal transmitted by baseband processing unit, and differentiate if the received baseband signal is a public baseband signal or a traffic baseband signal; the public carrier unit is connected to the baseband signal differentiating unit, and is further configured to receive a public baseband signal obtained by the baseband signal differentiating unit by means of differentiation, perform up-conversion and digital-to-analog DA conversion on the public baseband signal to obtain a public carrier signal, and transmit the public carrier signal to the public power amplifier unit; the traffic carrier module is connected to the baseband signal differentiating unit, and is further configured to receive a traffic baseband signal obtained by the baseband signal differentiating unit by means of differentiation, perform up-conversion and digital-to-analog DA conversion on the traffic baseband signal to obtain a traffic carrier signal, and transmit the traffic carrier signal to the traffic power amplifier unit; the public power amplifier unit is connected to the public carrier module, and is configured to receive the public carrier signal transmitted by the public carrier module, and output a public output signal after amplifying power of the public carrier signal; and the traffic power amplifier unit is connected to the traffic carrier module, and is configured to receive the traffic carrier signal transmitted by the traffic carrier module, and output a traffic output signal after amplifying power of the traffic carrier signal; characterized in that, the traffic power amplifier unit is further configured to be disabled in a case where there is no traffic signal or there is low traffic volume enabling the base station to disconnect or hibernate a transmission link of the traffic signal.