The invention discloses a spiral concentrating device and a concentrating method based on the same. The spiral concentrating device comprises a planar spiral pipeline, wherein one end of the planar spiral pipeline is provided with a feeding inlet, a partition is arranged at the other end of the planar spiral pipeline to separate the same into an inner discharge outlet and an outer discharge outlet, the discharge outlet located on the outer side relative to the center of the planar spiral pipeline is provided with a concentrate discharge outlet, and the discharge outlet located on the inner side relative to the center of the planar spiral pipeline is provided with a circulation water discharge outlet. Compared with a traditional gravity concentrating device, the concentrating device with the spiral pipeline structure has the advantages that the concentrating device is simple and compact in structure, small in floor space, adjustable in water pressure, and the like; evidently higher work efficiency is achieved as compared with other concentrating methods, the concentrating device matched with a control system can reduce manual adjusting time, the concentrating device is allowed to be high in flexibility and intelligent level, the proportion of the concentrate discharge outlet and the circulation water discharge outlet is adjusted automatically, and work efficiency is further increased.