Soft metal ultralong deep hole processing tool bit

The utility model discloses a soft metal overlong deep hole processing cutter comprising a cutter body. An outer cutting tip is welded at the front end of the cutter body, a guide block A is welded in a 180 DEG corresponding position of the outer cutting tip, an inner cutting tip is welded above the outer cutting tip, interlocking tooth cutting tips are welded between the guide block A and the inner cutting tip as well as below the guide block A, a guide block D is welded on the circumference of the cutter body between the outer cutting tip and the guide block A, a front rake angle Gamma 02 of a cutting chin of the outer cutting tip ranges from 5 DEG to 10 DEG, a primary clearance Alpha 02 ranges from 15 DEG to 25 DEG, a tool cutting edge angle Phi 2 ranges from 10 DEG to 20 DEG, a front rake angle Gamma 02 of a cutting chin of the inner cutting tip ranges from 5 DEG to 10 DEG, a primary clearance Alpha 02 ranges from 15 DEG to 25 DEG, a tool cutting edge angle Phi 2 ranges from 10 DEG to 20 DEG, a negative rake angle ranging from -5 DEG to -10 DEG is arranged at a center drilling position, a front rake angle Gamma 03 of a cutting chin of the interlocking tooth cutting tips ranges from 5 DEG to 10 DEG, a primary clearance Alpha 03 ranges from 15 DEG to 20 DEG, and the tool cutting edge angle Phi 3 ranges from 5 DEG to 15 DEG. The overlong deep hole processing cutter of the utility model has good self-guidance property and stability and stable processing quality, and the oscillation does not happen.