Coal mine underground branch hole drilling bit

The utility model discloses an underground coal mine branch hole drilling bit, which relates to the technical field of underground coal mine drilling and comprises a bit body, a drilling tool apron is formed at the top of the bit body, a chip removal notch is formed in the top surface of the drilling tool apron, a guide column cavity is formed in the center of the top surface of the drilling tool apron, and a centering bit is arranged in the guide column cavity. A first threaded hole and a second threaded hole are formed in the outer wall of the drill bit body, a fixing notch is formed in the outer wall of the centering drill bit, an inner pressing plane is formed in the fixing notch, a conical head is arranged at the bottom of the centering drill bit, an inner limiting conical surface is formed on the outer wall of the conical head, and a circumferential limiting pressing head is locked in the first threaded hole. An outer pressing plane is formed at the tail end of the circumferential limiting pressing head