Inner cooling cutter for side wall machining

The invention discloses an inner cooling cutter for side wall machining. The inner cooling cutter comprises a rod-shaped body, wherein the rod-shaped body is divided into a cutting part and a handle part; in the cutting part, a plurality of chip grooves are formed by spirally extending from the end of the free end of the cutting part to the handle part, the surface, facing the cutting rotation direction, of each chip groove is a front cutter surface, the front cutter surfaces and the peripheral surface of the cutting part are intersected to form a circumferential cutting edge, the surface, connected with the cutting edge, of the peripheral surface of the cutting part is a rear cutter surface, and the rear cutter surface extends to the handle part from the end of the free end of the cutting part; and in the handle part, a plurality of jet flow cooling holes are formed in the direction extending from the end of the free end of the handle part to the cutting part, one end of each jet flow cooling hole penetrates