The invention relates to a turning tool with a chip breaking device. The turning tool comprises a tool handle. A tool rest is formed at one end of the tool handle. A mounting groove is formed in the tool rest. A tool bit is installed in the mounting groove. The turning tool with the chip breaking device is characterized in that a positioning hole is formed in the tool rest, and the tool rest is covered with a cover plate; the cover plate is fixedly connected with the tool rest through a bolt penetrating through the cover plate and penetrating into the positioning hole; a stop arm is formed on the cover plate and covers the tool bit; the end of the stop arm is flush with the tool bit, and the outer side of the stop arm forms an oblique plane; and a raised edge capable of preventing cuttings from moving and cracking the cuttings is formed at the junction of the oblique plane and the upper end face of the stop arm. The tool rest is covered with the cover plate, the cover plate is fixedly connected with the tool rest through the bolt penetrating through the cover plate and penetrating into the positioning hole, the stop arm is formed on the cover plate, the tool bit can be pressed and covered below the cover plate through the stop arm, and thus the tool bit cannot be disengaged.