The invention discloses a method for manufacturing multi-wedges sliding bearing, which comprises: machining the sliding bearing inner ring into a circle with radius equal to the non-circular base inner radius of bearing; using a multi-pawl chuck to apply forces with same number, distribution and magnitude with the multi-pawl chuck to the surface of the bearing outer ring, to produce a pre-deformation on the bearing, the forces are directed to the axle center and applied around the circumference uniformly, while the forces near the two ends on the axial of the bearing are zero; machining the bearing according to the bore machining method, keeping the machining radius same to the first non-circular base inner radius of bearing; removing the applied forces to enable the bearing to rebound tothe needed shape. The sliding bearing has a plurality of wedge zones, can improve bearing work stability and running precision, keep end round, reduce end oil leakage, and improve bearing capacity. And the bearing can be machined easily, has higher practical value.