Wheat and corn selecting machine

The invention relates to a wheat and corn selecting machine in agricultural machinery. According to the wheat and corn selecting machine, impurity removing and selecting of wheat and corn are achieved. According to the technical key points, a feeding hopper and an exhaust fan are arranged on the upper portion of a rack, and an upper box body is arranged below the feeding hopper and the exhaust fanand internally provided with a first screen cloth which is in an oblique shape; a lower box body is arranged below the upper box body and internally provided with an upper layer screen cloth and a lower layer screen cloth; the upper box body and the lower box body are connected through two pairs of rocker arms, and the pair of rocker arms with the two opposite sides are connected with an eccentric wheel on the rack through a connecting rod; and a power supply control cabinet on the rack is connected with a motor on the rack, and the motor drives an eccentric wheel shaft and the exhaust fan. The wheat and corn selecti