The invention discloses a cyclone dust collector used in the process of harmless treatment of diseased animals. The outer wall of the cylinder is provided with an air inlet, the upper end of the cylinder is connected with a head, and the head of the head is The upper part is provided with a pipe that runs through the cylinder, the upper end of the pipe is provided with an air inlet, the upper part of the inner wall of the pipe is provided with a fine mesh, and the lower part of the fine mesh is provided with a coarse mesh that is close to the inner wall of the pipe. The bottom of the cylinder is connected with the conical cylinder, and the bottom of the conical cylinder is provided with a dust collection port. In the present invention, coarse and fine filter screens are arranged at the air outlet. After the high-temperature steam containing material dust particles undergoes first-level dust reduction treatment in the equipment, the coarse and fine filter screens set at this position can realize secondary filtration when it is discharged through the air outlet. treatment, the efficiency of dust removal is really improved, the operation stability is strong, the problem of pipeline blockage in the next process caused by incomplete treatment is eliminated, and the efficiency of harmless treatment is improved.