The utility model relates to the technical field of hole drilling rods, in particular to a mine reaming drilling rod which comprises a drilling rod mechanism, the drilling rod mechanism further comprises a drilling rod body, a penetrating through hole is formed in the inner wall of the drilling rod body, a threaded groove is formed in the inner wall of one end of the drilling rod body, and the other end of the drilling rod body is connected with the threaded groove. The outer side of one end of the
drill rod mechanism is provided with a hole expanding drilling tool
assembly used for expanding the hole
diameter of a mine
drill hole. In the first step, the third reaming sleeve is used for primarily reaming an original drilled hole, then the reaming
diameter is continuously increased through the second reaming sleeve, further, a
drill bit on the outer side of the first reaming sleeve is
cut in for reaming to form a basic hole with a larger
diameter, and compared with single-stage reaming and multi-stage gradual reaming, the single
cutting load can be reduced, and the
machining efficiency is improved. And meanwhile, the risk that the hole wall roughness exceeds the standard or the
drill bit is broken due to the fact that one-time reaming is too large is avoided.