The invention provides a multifunctional
diamond drill bit and a working principle thereof. The multifunctional
diamond drill bit comprises a connector, a threaded cavity, a
drill bit main body, a connecting block, a first connecting hole, a second connecting hole, an extending drill rod structure, a connecting fixing rod structure and a rotating ring structure, wherein the threaded cavity is formed in the lower surface of the connector; the
drill bit main body is welded at the top of the connector; and the connecting block is arranged at the upper surface of the
drill bit main body through injection molding. Through the arrangement of the extending drill rod structure, during the hole drilling, the
diameter of a
drill hole can be conveniently enlarged, and meanwhile, the functions of thediamond
drill bit are also added; through the arrangement of the connecting fixing rod structure, the
diamond drill bit can be conveniently reinforced, and meanwhile, the connecting
modes of the diamond drill bit are also added; through the arrangement of the rotating ring structure, the length of the rotating ring structure can be conveniently extended; and meanwhile, during the installation of the diamond drill bit, the fastening performance of the diamond drill bit can be enhanced.