Waste gas dust removal device for grain dryer

The utility model discloses a waste gas dust removal device for a grain dryer, which is provided with a box shell and a transmission belt device, a transmission belt body of the transmission belt device is in a grid shape, wet and hot air discharged from the grain dryer passes through the transmission belt body, dust and other impurities are hung on the grid and cleaned by a brush I, a dirt collection box is arranged below the brush I, and the dirt collection box is arranged below the brush II. A water spraying pipe is arranged above the brush, and impurities enter the dirt collecting box through the dirt collecting box; the inner side of a bottom plate of the box shell is arranged to be a slope surface, small dust particles can slide to the slope bottom at the slope surface, a second brush is arranged at the lower end of the slope surface in parallel along a side line, a liquid level meter is arranged on the lower edge of the side wall adjacent to the lower end of the slope surface, and when a proper liquid