Multifunctional positioning tool with cleaning function for automobile part machining

The invention relates to a multifunctional positioning tool with the cleaning function for automobile part machining. The tool comprises a flange plate, a transmission shaft and an air ring, a bearing is embedded in the flange plate, the transmission shaft is assembled in the flange plate through the bearing, a butt joint base is arranged at the right side of the transmission shaft, and a tool chuck is installed at the right end of the butt joint base through a bolt; and the positioning tool is fixed to the right wall face of a gearbox of a machining lathe through the flange plate, the left end of the transmission shaft is fixedly connected with a driving shaft in the gearbox so that the transmission shaft can drive the butt joint base and the tool chuck to rotate synchronously, and when a blocking base rotates along with the chuck, the air ring is forced to extrude leftwards and exhaust outwards. Exhaust gas is sprayed to the chuck through a gas pipe, granular fine waste falling into gaps of the chuck is spr