Abstract: Aiming at the transmission characteristics of coal mine low-voltage power line, this article proposes the signal extraction and transmission technology based on CLUSTER-OFDM. It also establishes its mathematical model, and establishes the coal mine subgroup distribution mechanism based on CLUSTER-OFDM. According to the simulation and experiment, it proofs the feasibility of the CLUSTER-OFDM signal extraction and transmission technology. The experiment results show that the technique had some improvement for the elimination of peak to average power ratio of OFDM technology, which improves the reliability of the received signal of the users.