To provide a dust removal device for an incinerator capable of further improving a dust removal effect of smoke by water.

The dust removal device for the incinerator formed in an incinerator 1 upper part and removing soot and dust included in smoke is provided with a horizontally extended shielding plate 12 shielding an upward flow of the smoke, an exhaust port 13 formed below the shielding plate 12, horizontally guiding the smoke with the upward flow shielded by the shielding plate 12 and exhausting it to the outside, a water supply means L2 capable of supplying water on the shielding plate 12, and a guide plate 14 guiding water supplied by the water supply means so it flows from an exhaust port 13 upper part to a lower part. By this, the soot and dust included in the smoke is removed by water flowing down the exhaust port 13 while exhausting the smoke from the exhaust port 13.