The invention relates to a device for removing low-density scum in the metal refining process, which belongs to the technical field of metal smelting. The device for removing low-density scum in the metal refining process includes a fume hood, an exhaust hood, a fixed pipe, and a cooler , dust collector, induced draft fan, dust outlet pipe, air inlet pipe, air duct, and a fixed adjustment device that can fix and adjust the position of the flue gas hood. The low-density slag removed by the present invention can be directly processed in the rotary kiln process, reducing a pretreatment process, which can greatly reduce the cost of production operations; The loss caused by the flying metal dust of slag; the number of staff can be greatly reduced, saving labor costs and improving economic benefits. At the same time, the invention also improves the mechanical automation level of the slag removal operation, reduces the intensity of repeated slag removal operations by employees, and improves production efficiency.