The present invention discloses a smart ODN system of low power consumption, and the system is related to the ODN field and includes a smart management terminal, a master control management board, and several wiring management boards, where the smart management terminal is directly connected to the master control management board, and is also connected to the master control management board through the Internet and a mobile terminal, the master control management board is connected with several wiring management boards, each wiring management board includes a PMU and a PQU, which are independent from each other, the PQU is connected to a CPU of a wiring management board through a control line; the PMU is configured to collect and store information data of a port and communicate with the master control management board or the smart management terminal; the PQU independent from the CPU independently performs the query operation on a wiring port, and promptly obtains a port connection status. The present invention more than doubles operation time of a smart ODN management system, extends battery life of the whole system when a mobile power supply provides power for the system, shortens a time span taken by the system to respond to port changes, and improves operation efficiency of the system.