CATV power supply is a commonly used device in the network, mainly for workstations and amplifiers. The CATV system dopts a centralized power supply method, which can improve the lightning protection performance of the cable TV system, ensure the quality of the power supply, and can centrally and effectively manage the power supply to facilitate the remote power supply of the CATV equipment and avoid the outage and other failures caused by the unstable power supply of the regional or distributed power supply.