The invention discloses a grape screening machine. The grape screening machine comprises a material inlet, a conveyor belt, a slide chute, a screen and the like, wherein the conveyor belt is fixed through a support; the material inlet is located above the left part of the conveyor belt; the sliding chute is obliquely located on the right side of the conveyor belt in a left-high and right-down manner; the sliding chute is connected with the support through a shaft, and is fixed through an adjusting rack; the screen is arranged on the sliding chute; and a baffle plate is fixed on the lower-right end of the screen in a left-low and right-high slope manner. The grape screening machine is simple in structure and easy for operation; the characteristics that the elasticity of stalk and rotten grapes and the elasticity of fresh grapes are different, moving rules on the screen are different and the like are utilized, so that the stalk and rotten grapes can be effectively separated from the fresh grapes, and the separation purpose is achieved.