The invention provides a reactive power compensation apparatus which includes a power supply leading-out wire line group, a voltage indicating circuit, a current acquiring circuit, a plurality of groups of LC energy conversion systems, a power supply return line group and a controller. Two ends of the voltage indicating circuit are in electrical connection to two power supply leading-out lines. The current acquiring circuit is in connection to one power supply leading-out line. The plurality of groups of LC energy conversion systems are in corresponding parallel connection to the power supply leading-out line group, and each group of LC energy conversion system includes a LC energy conversion circuit, a reactance and a silicon controlled rectifier control circuit. The voltage indicating circuit, the current acquiring circuit and the silicon controlled rectifier control circuit are in signal connection to the controller. According to the invention, the reactive power compensation apparatus samples current signals of transmission lines, and the controller calculates reactive equivalent, and the LC systems convert reactive power, so that rapid processing of harmonic waves and rapid switching of the LC systems are realized, power grid is purified, and service life of electrical appliances is prolonged.