The invention provides a direct current control apparatus for a magnetic control transformer. The direct current control apparatus comprises current/voltage sampling circuits and current/voltage conditioning circuits, a DSP main control unit, a driving circuit and a controllable direct current power supply circuit, wherein the secondary side voltage and current of the magnetic control transformer are subjected to closing treatment by the direct current control apparatus; current and voltage signals pass through the sampling circuits and the conditioning circuits to be input into the main control DSP of the direct current control apparatus to be subjected to data sampling and filtering; the DSP performs data calculation and data analysis on the obtained data; the calculated and analyzed data is compared with a control requirement to obtain a regulation control signal, namely a PWM pulse signal; after the driving circuit receives the control signal, the switch-on and switch-off of an IGBT are directly controlled; and real-time and rapid control for the magnitude of the direct current power supply of the direct current control circuit are realized.