Low voltage power line communication is an important technology of the electric power meter reading system. The low-voltage power line channel is complex and seriously affects the quality of carrier communication. Combining with relevant data, the paper analyzes the low-voltage power line channel noise environments. The multi-band spread spectrum technology is put forward and is applied to the power meter reading system in order to improve the performance of noise resistance. Characteristic polynomial of multi-band pseudo random sequence is proposed. The way of data shift register is used to produce multi-band spread spectrum code. The research of autocorrelation function characteristics and cross-correlation function characteristics of multi-band spread spectrum sequence is simulated. And the characteristics of error rate is presented. The results show that the performance of multi-band spread spectrum code is better than that of binary spread spectrum code. And it can improve the performance of characteristics of error rate. At the same time, low voltage power line meter reading scheme of multi-band spread spectrum is designed.