The invention relates to a material screening plant, and belongs to the technical field of food equipment processing. The invention structurally comprises a base, a screening frame, a mesh screen and an eccentric vibrator. The mesh screen is mounted on the screening frame and the eccentric vibrator is connected with the screening frame. A level partition board is arranged between the base and the screening frame. The screening frame is of an inclined structure. The upper end of the screening frame is matched with a material inlet device, and the lower end of the screening frame is provided with a material outlet port. The level partition board and a screw are fixed with each other. A screw barrel is sleeved on the outer side of the screw. The upper end of the screw barrel is hinged with the middle-upper portion of the screening frame. An adjusting nut is sleeved on the screw, and the upper end of the nut is provided with a gasket contacted with the lower end of the screw barrel. Through angle changes of the screening frame, various materials can be screened on one material screening device; and equipment efficiency can be effectively developed, space occupation can be saved, and the material screening device is convenient to use and operate.