Slag crusher

The utility model discloses a slag crusher, which is characterized in that a plurality of grooves are uniformly distributed on the surface of a rotating roller of the slag crusher along the circumference direction of the rotating roller, and an arc-shaped roller tooth fixing plate is detachably and fixedly connected in each groove; the surface of each roller tooth fixing plate is provided with two rows of roller tooth sets arranged in the length direction of the roller tooth fixing plate, and the roller tooth sets are arranged on the roller tooth fixing plates in a concave-convex mode. The roller teeth of the two roller tooth groups are arranged in a staggered manner, so that only one roller tooth is arranged in the width direction of the roller tooth fixing plate; the included angle between the end faces of every two adjacent roller teeth of the two roller tooth sets in the length direction is 90 degrees. The crusher has the advantages that the two rows of roller tooth sets are arranged on the roller tooth f