Positioning disc tapping machine

The utility model relates to a positioning disc tapping machine which comprises a machine frame, a machining groove is formed in the top of the machine frame, a three-jaw chuck used for clamping a positioning disc is installed in the machining groove, a connecting frame is fixedly connected to the top of the machine frame, and a screw tap used for tapping and a moving assembly used for driving the screw tap to move are arranged on the connecting frame. A cleaning cavity is formed in the rack and communicates with the machining groove through a waste chip opening, and an air inlet fan facing the three-jaw chuck is arranged on the side, away from the waste chip opening, of the machining groove. When the three-jaw chuck is used, a positioning disc needing to be subjected to tapping machining is installed on the three-jaw chuck, the position of a screw tap is adjusted through the moving assembly to conduct tapping machining on the positioning disc, air is blown to the positioning disc on the three-jaw chuck throu