The utility model discloses a milling machine that is used for cambered surface sheet metal processing that has taken shape, include: base (1), base (1) is connected with workstation (2), the upper end of workstation (2) has milling cutter frame (5), milling cutter frame (5) are connected with knife rest lathe bed (3), knife rest lathe bed (3) with feed reducing gear box (6) and be connected, workstation (2) still are connected with vacuum system, workstation (2) for C axle feed movement is made along the arc guide rail to drive cambered surface shaping sheet metal, feed reducing gear box (6),be used for control the feeding of knife rest lathe bed (3), vacuum system for vacuum adsorption method presss from both sides tightly and relaxs on workstation (2) the cambered surface is shaping sheet metal. Very easily cause the inhomogeneous phenomenon of thin and thick when milling the groove and fracture formula arc sheet forming appearing in order to solve in manufacturing process, to cause the problem of the extravagant and unqualified product of the material of arc sheet metal processing.