Narrowband power line communication system and power consumption management method thereof

The invention discloses a narrowband power line communication system and a power consumption management method thereof, and the system comprises a power consumption management unit which is connected with a zero-cross detection unit, an analog front-end unit, a transmitting unit, a receiving front-end unit, and an OFDM demodulation unit. According to the working state of the communication system, closing/starting of the analog front-end unit, the sending unit, the receiving front-end unit and the OFDM demodulation unit is dynamically adjusted, and the power consumption of the communication system is finely reduced. Furthermore, in three time slots of a power frequency half cycle, the analog front-end unit, the transmitting unit, the receiving front-end unit and the OFDM demodulation unit are in a turn-off state in a non-zero-crossing time slot, so that nearly 1/2 of power consumption of the communication system can be reduced; a receiving end is divided into a receiving front-end unit and an OFDM demodulation