The invention discloses a measurement and control power supply of a large soft control type variable frequency ozone generator, which is characterized in that a 380V 50Hz three-phase alternating current is connected to an alternating current reactor after the filtration of a three-phase power filter and the inspection by an active power meter and a power factor meter, and then transferred to a three-phase full-control power regulator module controlled by PLC by the alternating current reactor; and the three-phase full-control power regulator module outputs pulsatile direct current. The output of the three-phase full-control power regulator module is taken as power supply for adjusting voltage and current through a three-phase full-control fast switching thyristor, a double pipe inverter and a high power high-voltage transformer after filtration and smoothing of the filter. The measurement and control power supply of the large soft control type variable frequency ozone generator has output power up to hundreds of kilowatts, pertains to the controllable drive power with capacitive loading, is safe, reliable and has stable operation.