The invention discloses a current transformer electricity taking control method which comprises the steps of rectifying alternating electromotive force generated in a current transformer winding, and performing energy storage; detecting voltage of a rectified energy storage capacitor, comparing the voltage with reference voltage, and outputting a control signal according to the comparison; performing controller input energy consumption adjustment on a current transformer according to the control signal; performing output adjustment control on controller output voltage according to the control signal. The invention also provides a current transformer electricity taking control system. The current transformer electricity taking control system comprises a rectifying unit, an energy storage unit, a control unit, an input adjustment unit and an output adjustment unit, wherein the rectifying unit, the energy storage unit and the output adjustment unit are connected in sequence; the input adjustment unit is connected with the rectifying unit; the control unit is connected with the energy storage unit, the input adjustment unit and the output adjustment unit respectively. According to the current transformer electricity taking control method and the current transformer electricity taking control system, the efficiency and the stability of current transformer electricity taking can be improved, and a magnetic core can be protected.