This face milling machines are provided with special milling power spindle high-strength welded body and elevating column frequency conversion driving system and PLC process control system which enable automatic milling operation. Equipped with standard or profile milling cutters this line of milling machines can be satisfied for all kinds of face milling processes. Various types of work tables may be available for respective workpiece, such ash-shaped steel, box beams and the like which are mostly used in the industries of electricity, petrochemical, bridge building power station and boilers.