A control system for a wireless power switch without a NEUTRAL wire, the system comprising: a wireless controlled power switch with both terminals connected between a LINE wire and a switch wire of a switch box without the NEUTRAL wire; a power acquiring device having two power input terminals respectively connected to the LINE wire and the switch wire of the switch box, a power output port of the power acquiring device providing an output voltage; characterized in that the control system comprises: a wireless automation control device receiving the output voltage of the power acquiring device as required power, the wireless automation control device controlling open or close of the wireless controlled power switch according to wireless control signal wirelessly; wherein a load device is connected between the switch wire and the NEUTRAL wire, and impedance between the two power input terminals of the power acquiring device is substantially larger than impedance of the load device; when the wireless controlled power switch is open, a voltage provided by the LINE wire and the NEUTRAL wire crosses the power acquiring device and the load device that are connected in series; wherein the power acquiring device performs charging to store power in a rechargeable battery therein when the wireless controlled power switch is open, and the power acquiring device provides the stored power of the rechargeable battery to the wireless automation control device when the wireless controlled power switch is closed. a wireless controlled power switch with both terminals connected between a LINE wire and a switch wire of a switch box without the NEUTRAL wire; a power acquiring device having two power input terminals respectively connected to the LINE wire and the switch wire of the switch box, a power output port of the power acquiring device providing an output voltage; characterized in that the control system comprises: a wireless automation control device receiving the output voltage of the power acquiring device as required power, the wireless automation control device controlling open or close of the wireless controlled power switch according to wireless control signal wirelessly; wherein a load device is connected between the switch wire and the NEUTRAL wire, and impedance between the two power input terminals of the power acquiring device is substantially larger than impedance of the load device; when the wireless controlled power switch is open, a voltage provided by the LINE wire and the NEUTRAL wire crosses the power acquiring device and the load device that are connected in series; wherein the power acquiring device performs charging to store power in a rechargeable battery therein when the wireless controlled power switch is open, and the power acquiring device provides the stored power of the rechargeable battery to the wireless automation control device when the wireless controlled power switch is closed. a wireless automation control device receiving the output voltage of the power acquiring device as required power, the wireless automation control device controlling open or close of the wireless controlled power switch according to wireless control signal wirelessly; wherein a load device is connected between the switch wire and the NEUTRAL wire, and impedance between the two power input terminals of the power acquiring device is substantially larger than impedance of the load device; when the wireless controlled power switch is open, a voltage provided by the LINE wire and the NEUTRAL wire crosses the power acquiring device and the load device that are connected in series; wherein the power acquiring device performs charging to store power in a rechargeable battery therein when the wireless controlled power switch is open, and the power acquiring device provides the stored power of the rechargeable battery to the wireless automation control device when the wireless controlled power switch is closed.