The utility model discloses a shaking board for a combine harvester, which comprises a shaking board frame and step plates, wherein, the step plates are fixed in the shaking board frame, and straw shaking plates are arranged on the step plates at intervals; finger screen strips are fixed at the discharge end of the shaking board frame, and cleaning material dispersing plates are fixed between the adjacent finger screen strips; and straw shaking teeth are arranged on the cleaning material dispersing plates. The cleaning material dispersing plates play the role of prolonging the effective action length of the prior shaking board in a limited space under a limited space and limited constraint conditions, thereby improving the shaking and dispersing effect for agglomerate materials; meanwhile, a plurality of densificated cleaning material dispersing plates like a group of rectification gates, which objectively play the rectifying role for the pre-cleaning air flow, reduce the loss of the eddy current inside the pre-cleaning air flow and improve the separation efficiency of air flow.