The present invention provides a smart power management system, comprising a power management apparatus and at least one electric socket device. The plurality of electric socket devices produce a second wireless signal according to power consumption, and the power management apparatus receives the second wireless signal and computes relevant cost or the carbon footprint information shown on a display unit for reference. In addition, the power management apparatus also compares a setup signal inputted by a user to the second wireless signal, the electricity cost or the carbon footprint information to produce a first wireless signal, thereby controlling the plurality of electric socket devices for providing power supply or stopping power supply.