The difference between the pressurized three product dense medium cyclone and non-pressurized three product dense medium cyclone is: firstly, usually the primary pressurized three product dense medium cyclone is of cylinder or cone shape and the sencondary stage takes use of cone structure; Secondly, the pressurized three product dense medium cyclone mix the primary coal to be washed with the qualified dense medium suspension completely and then feed with pressure to the dense medium cyclone by the way of fixed pressure cabinet or pump so as to separate the concentrate coal, middling coal and gangue three products.