Draught fan for power generation assembly and power generation assembly

The invention discloses a draught fan for a power generation assembly and the power generation assembly. The draught fan for the power generation assembly comprises a support frame, a first rotating component, a second rotating component and a plurality of blades; the first rotating component and the second rotating component are rotationally arranged on the support frame, and the first rotating component is provided with an output shaft; and each blade is provided with a first end and a second end which are opposite to each other, wherein the first end is arranged on the first rotating component, the second end is arranged on the second rotating component, and a first gap is formed between every two adjacent blades. When wind blows, the blades are rotated through the wind, the first rotating component and the second rotating component are driven to rotate, the output shaft on the first rotating component rotates to drive a power generating mechanism to generate electricity, due to thefact that the first ends