The invention relates to a machine tool, in particular relates to a metal machining machine tool and belongs to the field of mechanical equipment. The basic form of the machine tool is a small bore, the machine tool comprises a machine tool body, a vertical column, a tailstock, a knife rest, a workbench and a main shaft box, wherein a hydraulic slipway is adopted for three movable freedoms, the knife rest (subjected to main shaft disassembly) is arranged on the workbench; the vertical column, the knife rest and the tailstock are in the same structure; a boring cutter, a grinding head, a saw blade, a milling cutter, a finger-type milling cutter, a pinion cutter, an vehicle tool holder, a planer tool rod, a slotting tool rod, a drill bit, a cutting torch, a welding torch, a welding handle, an electro-sparking head, a universal milling head, an embossing stylus, a measuring head, a centre or a phi 80 three jaw chuck are arranged on the main shaft box, or a flattish rotating tray, a chuck, a hob head, a fly-cutter frame and a cradle or an umbrella gear planing bench are arranged on the main shaft box. The machine tool provided by the invention has the advantages of automatic alignmentand clamping, laser location, numerical control marking, automatic measurement and numerical control sharpening instrument; and one machine tool can be used for realizing all the functions and the numerical control is full-automatic.