Gas dust collecting device

The invention provides a gas dust trapping device which comprises a filtering closed container which sequentially comprises a dust collecting area, a gas inlet distribution area, a dust trapping area and a gas discharging area from bottom to top, a baffle plate with inclination is arranged between the dust collection area and the gas inlet distribution area; a dust discharge port is formed in the wall of the filtering closed container where the dust collecting area is located; a gas inlet is formed in the wall of the filtering closed container where the gas inlet distribution area is located; a dust trapping tank is arranged in the dust trapping area, and a dust trapping filter is arranged in the dust trapping tank; the dust filtering and trapping device comprises at least one dust filtering and trapping layer, and the dust filtering and trapping layer is formed by sequentially arranging a plurality of inclined filtering plates; a gas discharge outlet is formed in the wall of the filtering closed container wh