The invention discloses an intelligent power control system and a power control method thereof. The intelligent power control system comprises a power supply, a power control unit, an instruction unit and an electric unit, wherein the electric unit is an electric equipment group comprising at least one piece of intermittent electric equipment or electric equipment comprising at least one intermittent electric device; all electric equipment of the electric equipment group or all electric devices of the electric equipment are connected with the power control unit through control switches and electric wires one by one; the instruction unit comprises a memory and an information transmission device; the power control unit comprises an information receiving device and a controller; the information receiving device receives an instruction from the instruction unit; and the controller controls on/off of the control switches according to the instruction to control power supply or power-off of the power supply to the intermittent electric equipment or the intermittent electric devices and to run the intermittent electric equipment or the intermittent electric devices at off-peak time, thereby achieving the targets of reducing electric charge and avoiding overload.