The utility model provides an intelligence economize on electricity water purifier system, it becomes the power high -pressure pump to be equipped with the intercommunication nuclear of counting between them between adjacent filter element group spare, the RO membrane filter core subassembly that the delivery port that becomes the power high -pressure pump with this number nuclear is linked together and comprises the parallelly connected a plurality of RO membrane filter core that set up, the setting count that nuclear becomes between power high -pressure pumps and this a plurality of RO membrane filter core and with the multichannel water inlet solenoid valve of latter's one -to -one, it includes a multinuclear motor to count nuclear change power high -pressure pump, this multinuclear motor include two at least above stators and with these at least two a plurality of rotors that above stator acted on mutually, count nuclear change power high -pressure pump and multichannel water inlet solenoid valve and can realize the output of evaluation of crosses and then adjustment multinuclear motor and the open -closed state who controls multichannel water inlet solenoid valve to the stator of acting according to the control command that water purifier the control unit sent, adjust a plurality of RO membrane filter core's combination work number from this, and then the total flow of adjustment RO membrane filter core subassembly.