The invention discloses a reactive compensation discharge device, which is characterized in that a primary-side three-phase winding of a three-phase transformer is in Delta-type connection or Y-shaped connection; the primary-side three-phase input end of the three-phase transformer is connected with the three-phase input end of a reactive compensation capacitor group in parallel; a secondary-side winding of the three-phase transformer is set to an open-delta connection mode, and impedance is accessed to the open-delta shape; and after a circuit breaker removes the reactive compensation capacitor group from the system, the interphase equivalent impedance and the reactive compensation interphone capacitance of the reactive compensation discharge device in the reactive compensation capacitor group form a discharging circuit for discharging. After the circuit breaker powers off the reactive compensation capacitor group, the reactive compensation discharge device discharges rapidly to the reactive compensation capacitor group, so that the voltage pressure of an on-off cut is smaller than the insulation intensity, and therefore the reignition of the reactive compensation capacitor group which is powered off by the circuit breaker is eliminated.