The invention discloses a method for manufacturing an impeller of a desulphurization circulating pump, which comprises the steps of: 1) blank preparation, namely, preparing blanks of a front cover plate, vanes, a front end plate, a rear end plate, a closing plate, a connecting cylinder, a seal receptacle and a mounting housing, wherein all the blanks adopt stainless steel; 2) the machining of each part; 3) scribing; 4) assembly welding, namely, forming a semi-finished product of the impeller; 5) the generation of vibration effect, namely, mechanically vibrating the semi-finished product to eliminate stress; 6) the half-finished turning of the mounting shaft housing; 7) balance correction, namely, realizing the dynamic and static balance of the impeller; 8) the generation of secondary vibration effect; 9) finished turning; and 10) spay welding, namely, spray-welding hard alloy layers on the surfaces of a front cover and the vanes, the outer surfaces of the front end plate, the closing plate, the seal receptacle and the rear end plate and the two end faces of the connecting cylinder. The method has the advantages of convenient machining and relatively lower cost; and the obtained product has the advantages of high corrosion resistance and wearing resistance, light weight, high strength, long service life and good maintainability.