The invention provides a power line carrier communication method. The power line carrier communication method comprises a low-speed robust communication method based on a leader sequence; the robust communication method provides an auxiliary communication mode used when effective communication cannot be provided in a conversional mode in a severe channel environment. The power line carrier communication method is based on leader signals and a processing method of the leader signals, and timing and synchronization can be achieved in a packet switching data network. When normal communication cannot be carried out in the conversional communication mode, a user can try to conduct communication in the robust communication mode. The robust communication mode provided in the power line carrier communication method can provide the low-speed and reliable communication when reliable work cannot be provided in the conversional communication mode, the basic communication requirement of a network is met, and the network failure rate is decreased.