Provided are air-conditioning draught fan impeller and method for preparing same. The vane and end ring are integrated into caddy. The middle disc is single sheet with the axle sleeve aperture and roughness in the middle, and opening as well as regulating aperture at side part. The opening communicates to the regulating aperture. The axle sleeve rivets the middle disc axle sleeve aperture. The middle disc opening clamps caddy vane curve surface and couples together. The producing method comprises caddy moulding: whole plate stamping to form vane and blank, welding into cylinder, two ends curling moulding to end ring; middle disc moulding; whole plate stamping to form opening and regulating aperture; axle sleeve coupling to the middle disc axle sleeve aperture; impeller moulding; making the middle disc opening clamp the vane curve surface, mechanically coupling to two sides of the middle disc opening, enabling the middle disc and vane to couple together to form impeller. The invention can be used for centrifugal air-conditioning fan. |