Centre drilling machine tool

A centre drilling machine tool comprises a horizontal workbench, wherein a drive clamp assembly and a driven clamp assembly are respectively arranged at the middle part of the horizontal workbench, a fixed tailstock assembly and an adjustable movable tailstock assembly are respectively arranged at the two sides of the horizontal workbench, a left-handed rotation centre drill is assembled on the fixed tailstock assembly, a right-handed rotation centre drill is assembled on the adjustable movable tailstock assembly, air cylinders are respectively fixed at the rear parts of the fixed tailstock assembly and the adjustable movable tailstock assembly, a linear guide rail assembly is arranged between the upper body of the adjustable movable tailstock assembly and a base, and a location oil cylinder is fixed at one side of the drive clamp assembly on the horizontal workbench. According to the centre drilling machine tool, the deviated centre drilling phenomenon can be prevented from occurring; and meanwhile, an adjustable clamping drive device is adopted, so the centre drilling machine tool can be suitable to drill centre holes for shafts of different lengths.