The invention discloses a manufacturing method for a powder metallurgy supporting base. The manufacturing method comprises the following steps: mixing iron, chromium, molybdenum, manganese, nickel, carbon and copper in percentage by mass to obtain mixed powder; designing a different number of lug bosses at the outer edge of a supporting base green body; pressing the mixed powder into the supporting base green body with density of 6.2-7.2g/cm<3> on a press; sintering the supporting base green body for 5-180 minutes at a temperature of 1000-1350 DEG C, and annealing in a non-oxidizing atmosphere; extruding on a special extrusion molding machine or a press modified by a finishing press, wherein extrusion deformation amount is greater than or equal to 2% in a diameter direction; selectively processing according to dimension requirements, and carrying out vapor treatment. The manufacturing method has the advantages that: the manufacturing process is simple, the precision is high and the surface smoothness is good, and the problem that a mould is easy to generate chaps at a high temperature in a forging process is effectively solved, so that the production cost is reduced, and the production efficiency is improved. Compared with a conventional powder metallurgy process, the product density is higher, and surface densification is realized.