The invention relates to a classification crusher, and in particular relates to a self-dust-removal type classification crusher which comprises a transmission mechanism, a walking stand, a crushing roller and crushing teeth, wherein a water storage cavity is formed in the crushing roller; the water inlet end and the water outlet end of the water storage cavity are connected with a high-pressure water source and a nozzle arranged on the outer surface of the crushing roller respectively. Compared with the prior art, the self-dust-removal type classification crusher has the advantages of being simple in structure and high in efficiency.