The invention relates to a dense medium cyclone for monomer different-diameter products. The dense medium cyclone comprises cylindrical sections, a circular cone section, a concentric overflow pipe, a feeding port and a bottom flow port, wherein at least two cylindrical sections in different diameters are arranged; the circular cone section is butt-jointed with the bottom of the cylindrical section with the smallest diameter; two or more cylindrical sections in different diameters are connected through diameter-changing structures; through the diameter-changing structures, the materials and suspension liquid can enter into the next cylindrical section from the previous cylindrical section along a tangential direction; low-density material and high-density material can be acquired by adopting one cylindrical section for sorting; the low-density material is drained from the overflow pipe on the outer side; the high-density material stably enters into the next cylindrical section along the tangential direction through the diameter-changing structures and is sorted on the next cylindrical section; the middle-density material product is drained from the overflow pipe on the outer layer; the high-density product enters into the next cylindrical section and is sorted or drained from the bottom flow port. The dense medium cyclone for monomer different-diameter products has the advantages of compact structure, convenience in mounting, capability of sorting multiple products from one density material and suitability for the users having different coal quality requirements.