In this paper, for physical-layer se-curity (PLS), a novel scheme of polar coding encryption is introduced in the wiretap chan-nel (WTC) model. To decrease transmission overhead of the shared secret information and enhance the security performance against an attacker, we have employed the two following encryption technologies: Firstly, randomiza-tion of output bits is not dependent on the traditional randomized bit-channels but they are directly flipped through the random bit sequence. Secondly, for employing Advanced Encryption Standard (AES), we utilize the se-cret seed to extend an initial secret key of AES cryptosystem, which it appears a good ava-lanche performance. Result analyses demon-strate that the proposed scheme is strongly resistant against conventional attacks.