Negative pressure dust-removing system for grain dust

The invention discloses a negative pressure dust-removing system for grain dust. The negative pressure dust-removing system comprises a grain cabin, wherein a bucket elevator is fixedly connected withan outlet on the lower surface of the grain cabin; a crushing device is fixedly connected with the outlet on the rear side of the upper surface of the bucket elevator; a vibration screen device is fixedly connected with the outlet of the crushing device through a conveying device; a buffering cabin is fixedly connected with the outlet of the vibration screen device through the conveying device; apackaging device is fixedly connected with the outlet of the buffering cabin through the conveying device; an exhaust pipe is fixedly connected with the upper surfaces of the crushing device, the vibration screen device, the buffering cabin and the packaging device; a connecting pipe is fixedly connected with the upper surface of the exhaust pipe; a cyclone dust removal device is fixedly connected with the outlet of the c