The invention discloses a corn harvesting and granulating device, which comprises an ear cutting and guiding unit, a retracting roller is arranged above the side of the ear cutting and guiding unit, a guiding unit is arranged at the rear of the cutting and guiding unit, and the guiding unit includes a guiding cover. The guide cover is fixedly arranged on the periphery of the guide belt, the lower port of the guide cover is set correspondingly to the ear guide mouth, the upper port of the guide cover is connected with a threshing unit, the threshing unit includes a threshing cover, and a threshing roller is installed inside the threshing cover. The end of the threshing roller is equipped with a threshing roller pulley. The invention has small harvest loss and low grain breakage rate, and is equipped with a bract peeling device, which can remove the bract leaves cleanly. When the straw is returned to the field, the crushing effect is good, and the scatter is even. When the straw silage is harvested, the harvest rate is high, and the chopping is uniform; the work is reliable and the applicability is strong. It can adapt to different row spacing, natural height, yield, maturity and even lodging corn and different planting agronomy.