The invention provides a cleaning and conveying device for a combine harvester, and belongs to the technical field of combine harvesters. The cleaning and conveying device for the combine harvester comprises a body frame, a vibrating screen device, a fan assembly, a collection bin and a grain conveying device, wherein the vibrating screen device is obliquely arranged on the body frame; the fan assembly is arranged on the body frame, faces to the vibrating screen device, comprises a fan cover plate and a fan, the fan comprises a big end and a small end, and the wind speed of the big end is larger than that of the small end; the collection bin is arranged in the body frame, and located below the vibrating screen device; the grain conveying device communicates with the collection bin, and is arranged on the body frame; the fan assembly provides horizontal wind and transverse wind for the vibrating screen device, threshed materials of crops fall into the vibrating screen device, and are cleaned, the threshed materials of the crops are driven by the transverse wind to be uniformly distributed on the vibrating screen device, the threshed materials of the crops fall into the collection bin, and the grain conveying device is used for conveying the threshed materials of the crops in the collection bin. The cleaning and conveying device provided by the invention is good in cleaning effects, and high in conveying efficiency.