The invention relates to a channel concatenated coding and decoding method for power line carrier communication and an apparatus thereof. According to the coding process, an original information frame sent from an upper computer enters a frame location module for frame head location; after location, the original information frame enters a code scrambling module for code scrambling; after code scrambling, the original information frame enters an RS coding module for RS coding; and after an RS code is output, the original information frame enters a convolutional coding module for convolutional coding, and then the code is output. According to the decoding process, demodulated baseband coding information is sent to a Viterbi decoding module for convolutional decoding; after Viterbi convolutional decoding, original rate information is recovered; a frame synchronization module searches a frame head from the original rate information so as to realize frame synchronization; after frame synchronization, RS decoding data clustering information can be determined; a synchronization result is fed back to the Viterbi decoding module simultaneously; information with the frame synchronized enters an RS decoding module for RS decoding; and finally, a descrambling module descrambles the information so as to recover the original information frame. The channel concatenated coding and decoding method can be applied to a modulation-demodulation device of power line carrier communication, and can improve the anti-interference capacity of signals in transmission, transmission quality and transmission efficiency.