PURPOSE: A separation device of a bean thresher is provided to minimize mixing of beans and foreign materials by separating beans from foreign materials. CONSTITUTION: A separation device of a bean thresher comprises: a bean exhaustion guide plate(32) which is installed to slope downward in the main body and through which threshed grains and foreign materials move together; and a wrinkle plate(51) which repetitively forms valleys(51b) receiving beans and peaks(51a) on which foreign materials are placed on the bean exhaustion guide plate in the bean discharge direction. The valleys and peaks are formed sharp.
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