This invention relates to a dust removal system for dust gas which comprises at least an atomizer. The atomizer comprises an atomizing chamber and an atomizing mechanism; the atomizing chamber includes an inlet for the dust gas and an outlet for the gas after mixture; the atomizing mechanism comprises a water chamber, the first atomizing ball, the second atomizing ball, an umbrella-shaped atomizer, and a regulating mechanism; the water chamber includes the first and second water inlet and the first and second water outlet; the regulating mechanism adjusts the fit clearance between the first atomizing ball and the first water outlet, the fit clearance between the second atomizing ball and the second water outlet, and the flare angle of the umbrella surface of the umbrella-shaped atomizer. The preferred advantageous effect is: the two-stage atomization - coordinating the atomizing balls and the water outlets, and using an umbrella-shaped atomizer - guarantees the atomizing effect. When there are burrs accumulating in the water outlets, regulate the fit clearances between the atomizing balls and the water outlets to remove completely the influence of the blockage on the atomizing effect. And when there are burrs corroding the water outlets, regulate the fit clearances between the atomizing balls and the water outlets to remove completely the influence of the corrosion on the atomizing effect.