The utility model provides an eccentric moulding surface processing machine tool, belonging to the field of machining tool. A main axis(5) is arranged at a headstock(4) of a base(13) of the machine tool and fixed with a profile modeling(20). A holder core(6) of a slide bushing type air-powered tail-holder(8) is opposite to the profile modeling(20); a servo motor(23) is arranged at the base of the machine tool is fixed with a ball screw(17) through a resilient shaft coupling(22); the ball screw is provided with a swallowtail slipway(11) which is provided with a swallowtail sliding block(10), and a tracking knife rest(9) is arranged at the swallowtail sliding block. The utility model has the advantages of simple structure and convenient use, good process precision and high process efficiency, in addition, the utility model realizes the once positioning triaxiality profile machine shaping to the complex moulding surface component such as the eccentric moulding surface(such as the middle of the piston skirt is changed into an ellipse moulding surface), the combination of the eccentric moulding surface and other moulding surfaces, etc.