The invention discloses a high-performance welding processing method of a powder metallurgy chain wheel. The high-performance welding processing method comprises the steps of forming, sintering, thermal treatment and stored energy welding, wherein the welding step is a stored energy welding step carried out through adopting a stored energy welding machine; welding is carried out once; tempering is carried out twice; the welding voltage is 320 to 380 V; the tempering voltage is 350 to 450 V; delayed tempering is carried out for (70 to 130) * 10 MS; prepressing is carried out for (180 to 220) * 10 MS; pressurization is put forward by (150 to 200) * 1 MS; pressurization is carried out for (10 to 25) * 10 MS; after welding, the welded wheel is kept in the state for (8 to 20) * 10 MS; tempering is carried out twice; and the air pressure is 0.4 to 1.0 Mpa. According to the high-performance welding processing method, the powder metallurgy chain wheel has welding bumps, and sheet steel which does not have bumps on a welding gasket is adopted as a substrate, and a product meets the requirements on welding performance and appearance through a special stored energy welding technological method; and electric charge is stored in a capacitor with certain capacity, a welding torch instantaneously discharges through a welding material and a workpiece, and one-time welding and two-time tempering are adopted, so that metallurgical bonding is achieved at an instantaneous contact point part of the powder metallurgy chain wheel and the sheet steel, the strength is high, and the appearance is not burnt.