The invention discloses a collection and distribution balance type high-voltage SVG control apparatus and control method. By means of operation of a three-phase target current of a power grid and the output current of a three-phase current conversion chain of the SVG apparatus, a three-phase instruction current is obtained; the output voltage of the three-phase current conversion chain, the active voltage component U, the reactive voltage component U, a modulation ratio M and a control angle are worked out and sent to each power unit sub system; the power unit sub system calculates a singe wave modulation signal phase to obtain a three-phase modulation wave; through SPWM modulation, two exclusion level signals are output, and only one power device of each bridge arm is switched on at the same moment; the power unit sub system outputs direct current side capacitance and voltage signals, and meanwhile, uploads direct current voltage and temperature data to a main control system; the respective tasks of the high-voltage SVG are reasonably distributed among three systems; the main control system does not bear PWM pulse calculation and generation any more; and each power unit sub system receives the same control signal, so that the product can be expanded in different voltage levels simply and conveniently, and higher adaptivity and better performance are achieved.