The invention provides spinning-current tailing desliming equipment and a method. The spinning-current tailing desliming equipment comprises a barrel with a tapered bottom. An ore discharging outlet is formed in the tapered bottom. The equipment is characterized in that a feeding inlet is formed in the barrel in the tangential direction, a separated spinning flow buffer mechanism is arranged at the bottom of the barrel, a clearance is kept between the bottom of the separated spinning flow buffer mechanism and the tapered bottom of the barrel, the upper end of the barrel is provided with an overflow port, an overflow groove is formed in the periphery of the overflow port, and the overflow groove is connected with overflow tubes. The ore dressing yield can be increased, the desliming efficiency can be improved, the energy consumption is low, the cost is low, solid mud in mud flow can be collected for backfilling, upper layer water after sedimentation can be recycled, secondary pollution is not caused, the ore dressing efficiency of deslimed ore can be greatly improved by 60-80%, obtained composite ore sand is high in purity, no additive is added in the desliming process, natural treatment is achieved, the environment is not polluted, the equipment and method belong to a desliming process link in controlling the extraction efficiency and cost in tailing extraction, and a technical support is provided for extraction of nonferrous metal tailings.