The invention relates to the field of machining, in particular to a bolt ball machining device. The device comprises a base, a tool guide device is arranged on the top of the base, a machining deviceis arranged on the top of the tool guide device, a workpiece guide device is arranged on one side of the tool guide device, a workpiece adjusting device is arranged on the top of the workpiece guide device, a tool changing device is arranged at the position, on one side of the tool guide device, of the base, an air pump work station is arranged on the rear side of the base, and the tool guide device, the machining device, the workpiece guide device and the workpiece adjusting device are connected with an outer general numerial control system. A bolt ball can be rapidly and efficiency machined,in the process of part machining, according to different working procedures, tools can be automatically selected and replaced, the machine tool rotating speed, the feeding amount, the motion track ofa tool relative to the workpiece and other parameters are automatically changed, workpiece machining can be efficiently and rapidly finished in sequence, needs of people can be more effectively met,and problems existing in the prior art are solved.