The utility model discloses an electrified oil supplementing device of a high-voltage circuit breaker, which comprises a rack that is fixedly connected with a first support plate and a second supportplate; a first rotating disc penetrating through the first supporting plate is rotatably connected to the first supporting plate, a plurality of first connecting pipes which penetrate through the first rotating disc and are distributed in a circular mode are fixedly connected to the first rotating disc, and a circle formed by the first connecting pipes and the rotating disc are concentric circles;wherein a flowmeter and a valve are arranged on the first connecting pipe, the first connecting pipe is communicated with a transparent hose, the transparent hose is communicated with an oil drain valve of an oil cylinder, and a butt joint is arranged at one end, far away from the transparent hose, of the first connecting pipe; a plurality of movable second connecting pipes corresponding to the first connecting pipes in position are arranged on the second supporting plate, butt joints are arranged at one ends of the second connecting pipes, and the ends, away from the butt joints, of the second connecting pipes communicate with the oil storage cylinder; the oil supplementing device has the advantages of simplicity in operation, high oil supplementing efficiency, high safety and the like.