Abstract: Due to the broadcast nature of the channel, the power line communication（PLC） is vulnerable to eavesdropping attacks. In the conventional secure transmission scheme based on full-duplex（FD）, only the receiver（Rx） transmits the artificial noise（AN）. Thus, the security performance will degrade significantly if the eavesdropper is closer to the transmitter（Tx）. To improve the security, this paper proposes the dual-artificial-noise secure transmission mechanism based on FD for the single-input singleoutput（SISO） PLC system with channel correlation. The mechanism consists of two phases. In the first phase, the legitimate Tx and Rx transmit the independent AN simultaneously based on the FD technology. The second phase transmits the confidential signal which is encrypted by Tx according to the AN received in the first phase. In the meantime, the Rx transmits AN while receiving the signal by the FD technology. With the non-independent identically distributed log-normal fading channel, the average secrecy capacity, secrecy outage probability and secrecy throughput are theoretically analyzed to determine the power allocation coefficient, and the simulation verification is carried out. The results show that the proposed scheme is robust to the time-variation of the main channel and the correlation between the main and wiretap channels. Compared with the conventional FD-based secure transmission scheme, the proposed scheme can still provide a higher secrecy throughput even when the eavesdropper is closer to Tx.