Home-entry power line adapter and communication system and method based on power line

The invention provides a home-entry power line adapter and a communication system and method based on a power line. The home-entry power line adapter comprises a first communication module, a modem module and a second communication module. When broadband is in a downlink state, the first communication module receives an Ethernet signal from an optical access terminal, the Ethernet signal is modulated to a power line broadband signal by the modem module, and the second communication module sends the power line broadband signal to a client-side power line adapter through the power line. When the broadband is in an uplink state, the second communication module receives a power line broadband signal which is transmitted by the client-side adapter through the power line, the power line broadband signal is modulated to an Ethernet signal by the modem module, and the first communication module sends the Ethernet signal to the optical access terminal. According to the home-entry power line adapter and the communication system and method based on the power line, fixed broadband entering home and wireless local area network (WLAN) signal deep coverage are achieved, and the fixed broadband access rate is increased.