The invention discloses a breaking system for oil-containing scrap steel machining. The breaking system comprises a frame, a breaker, a hoist, a working platform and a conveyor; the breaker is arranged in the frame; the working platform is arranged at the upper part of the frame; a feeding port is formed in the upper part of the breaker; the hoist is arranged on the outer side of the frame and leans against the outer side of the working platform; a discharging port is formed in the bottom of the breaker; the conveyor is arranged below the discharging port; one end of the conveyor and the frameare fixed; and a supporting frame is arranged at the other end of the conveyor. The breaker is mounted in the frame, and the hoist is arranged on the outer side of the frame, so that workers conveniently lift oil-containing scrap steel to the feeding port of the breaker, the loading is facilitated, the loading convenience is improved, the labor intensity is lowered, the oil-containing scrap steelis broken, high-temperature drying and cleaning are facilitated, and the cleaning quality is improved.