Honing tool for finish-machining minor diameter holes of diesel engine

The invention discloses a honing tool for finish-machining minor diameter holes of a diesel engine, which comprises a honing rod body, a honing base and a honing rod mandrel, wherein the inner part of the honing rod body is a hollow structure, a mounting structure matched with a honing machine is arranged at the tail part of the honing rod body, a honing base mounting groove is arranged on the front side face of the honing rod body, the honing base is located in the mounting groove, the length of the front end of the honing rod mandrel extends to the position of the honing base mounting groove, a slope is arranged at the front end of the honing rod mandrel, a slope matched with the honing base is arranged on the inner surface of the honing base, the honing base and the honing rod mandrel are in slide fit, the back part of the honing rod mandrel stretches out of the honing rod body with certain length, an axial locating structure is arranged between the honing rod mandrel and the honing rod body, and a spring