Detachable drilling tool

The utility model discloses a detachable drilling tool, relates to the technical field of drilling tools, and is used for conveniently punching according to the hardness condition of rocks. The drill bit comprises a mounting rod, a first drill bit body and a second drill bit body which are sequentially arranged, the mounting rod is used for being fixedly connected with a drill rod, the first drill bit body and the second drill bit body are round, the diameter of the first drill bit body is larger than that of the second drill bit body, first crushing teeth are arranged on the first drill bit body, second crushing teeth are arranged on the second drill bit body, and a mounting ring is arranged on the end face of the second drill bit body. When the drill rod is used, the mounting rod and the drill rod are in threaded connection, and then the drill rod can be used. When drilling needs to be guided to avoid drilling deviation, a guide rod can be additionally arranged. When the rock stratum is hard, the third dril