The utility model discloses a slag removal machine for civil engineering, including automobile body, crushing roller and sweeping roller, the top of automobile body is provided with the motor, the transmission shaft outer end of motor is provided with belt pulley a, belt pulley a's inboard is provided with belt pulley b and belt pulley b cover is located on the transmission shaft outer wall of motor, the person of the being provided with support piece an of department in the middle of the bottom of automobile body, support piece a's outer wall cover is equipped with crushing roller, support piece a's outer end is provided with belt pulley c, connect through belt a between belt pulley an and the belt pulley c. The utility model discloses an in the preceding watering that atomizes of automobile body, then smash, the watering that atomizes once more after smashing is cleaned granular waste residue to the collecting box in through sweeping roller at last, and water can the atomizing be swept to the upper end when cleaning, and is whole through the atomizing dust fall of sprinkling water, has effectually avoided the too big pollution of dust, has also avoided cleaning once more collection disintegrating slag no. 2 and has led to the fact dust contamination.