A power management system and hierarchical power switches and sockets thereof are mainly used to divide power source of one area into multiple ratings, and to layup supply lines and set the hierarchical power switches and the control switch based on this rating, thus to control the supply state of each service rating in the area by the using of the hierarchical power switches and the control switch, and then form hierarchical management mechanism to achieve the effect of the energy conservation, improve the security of the electric power system at the same time; The hierarchical power sockets are set on the ends of the supply lines, and the load device can be provided to select the connection the supply line in different service rating, achieving the energy conservation of hierarchical power management and the security of regional electricity supply.
