Abstract: In order to tackle the problems of unstable production operation and reduced separation efficiency caused by significant variations in raw coal slime content in the coal preparation plant of Xin′an Coal Industry Co. Ltd., the online switching of raw coal desliming/non-desliming beneficiation processes was achieved through transformation of the head chute of the raw coal feeding belt conveyor. By introducing the FBS fluidized separator and laminated high-frequency vibrating fine screen, as well as by transforming the coal slurry water system, the separation efficiency of coarse coal slime and flotation performance of coal slime were improved, this effectively solved the problem of “ash carryover” in dense medium cleaned coal, and significantly reduced operation costs, including material expenses and power consumption. The online switching beneficiation process between raw coal desliming and non-desliming significantly enhances the flexibility of the separation system, offering valuable insights for optimizing and innovating coal preparation processes under complex coal quality conditions.