In an intelligent completion system, the surface control part not only needs to provide power to the downhole equipment, but also needs to communicate with the downhole equipment. In this paper, a power line carrier communication system based on intelligent well completion is designed. In this system, the surface controller uses a single-core cable to transmit surface commands to the downhole by coupling them to the single-core cable, and the downhole equipment then couples ground commands from the single-core cable, which realizes communication with the downhole equipment and provides power to the downhole equipment to meet the power supply and communication requirements of the complex downhole situation.