Centrifugal fan and agricultural machine

The utility model relates to a centrifugal fan and agricultural machinery, the centrifugal fan comprises a fan volute of a split type structure, and a fan shaft and a fan impeller which are arranged in the fan volute, the fan impeller comprises a spoke welding part, fan blades and an impeller supporting plate, the spoke welding part is arranged on the fan shaft, the fan blades are arranged on the impeller supporting plate, and the impeller supporting plate is arranged on the fan shaft. The multiple fan blades are arranged in the circumferential direction of the fan shaft and supported and fixed to the spoke disc welding-on through impeller supporting plates, and at least one impeller supporting plate is arranged between every two adjacent fan blades. According to the split type fan volute structure, the fan blades are supported and fixed to the amplitude disc welding part through the impeller supporting plate, the fan blades can be independently detached from the amplitude disc welding part by detaching the i