Road cleaning unit and centrifugal fan impeller thereof

The invention discloses a centrifugal fan impeller and a road cleaning unit with the same. The centrifugal fan impeller comprises a wheel (3) and fan blades peripherally arranged on the wheel (3). The fan blades include long blades (1). In the direction from the center of the wheel (3) to the edge of the wheel (3), each long blade (1) sequentially comprises a first arc segment (4) and a second arc segment (5), the first arc segment (4) of the long bade (1) is a forward blade, and the second arc segment (5) of the long blade (1) is a backward blade. The centrifugal fan impeller is fine in aerodynamic performance and low in noise. The road cleaning unit with the centrifugal fan impeller is fine in cleaning capacity and product performance.