Special drill bit for underground pipeline exploration

The invention discloses a special drill bit for underground pipeline exploration. The special drill bit for underground pipeline exploration comprises a drill bit body, wherein the drill bit body is cylindrical, a connecting part matched with a drill stem of a drilling rig is arranged on the upper portion of the drill bit body, and the lower end of the drill bit body is planar. A water jetting hole is formed in the center of the drill bit body, a water drainage groove is vertically formed in the outer wall of the drill bit body, a water guide groove corresponding to the water drainage groove is formed in the bottom face of the drill bit body, the inner side of the water guide groove is communicated with the water jetting hole, and the outer side of the water guide groove is communicated with the water drainage groove. The special drill bit for underground pipeline exploration has the advantages that because the drill bit body is cylindrical, and the lower end of the drill bit body is of a planar structure, th