The invention relates to a manufacturing process of a stator, which comprises the following steps: (1) blanking: adopting a numerical control band sawing machine to carry out blanking with a verticality being smaller than or equal to 0.3; (2) annealing: adopting a well type vacuum annealing furnace to vacuumize and fill nitrogen for protection and annealing with an oxidation and decarbonization jersey knit being smaller than or equal to 0.1 and material hardness HB of 113-120 after the annealing; (3) blank preparing: adopting an ordinary C6130 lathe to prepare a blank by controlling a height error within 0.3; (4) lubrication process; (5) hole extruding: adopting an ordinary 4000KN oil press to extrude with extruding force P of 280T, an extruding hole diameter phi of 39+/-0.05 and an extruding depth of 70+/-0.5mm by reserving 5-6mm at the bottom of the hole after extruding with hole wall roughness of 1.6; and (6) gear extruding: adopting a 4000KN oil press to extrude with the extrudingforce P of 300T, gear accuracy of +/-0.03 and an extruding depth of 80+/-0.5mm.