A screening device for chemical raw materials, characterized by comprising a housing (1), with the screening frame (2) bent and movable on the inside of the housing (1), where the telescopic motor (3) is firmly attached to an inside of the housing (1), with an end of the telescopic engine (3) fixed with a The side of the screen aperture (2) is connected, the mesh screen (4) is firmly installed in the inner part of the screen aperture (2), with a first passage hole (5) in the middle of one side of the housing (1), with a second passage hole (6) at the bottom of the other side of the housing (1),where a deflector plate (7) is installed angrily and firmly between the first passage hole (5) and the second passage hole (6) in the housing (1), with a guide plate (8) installed angrily and firmly on one side of the inner top of the housing (1).
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