Combined filtering method and filtering device for impurities in regenerated wrought aluminum alloy casting rod

The invention relates to the field of alloy filtering, in particular to a combined filtering method and filtering device for impurities in regenerated wrought aluminum alloy cast rods, and the combined filtering method comprises the following steps: preliminary inspection: detecting attachments and impurities on the surface of waste aluminum, and carrying out surface treatment on the waste aluminum containing the impurities; smelting: smelting the detected waste aluminum raw material to form a liquid alloy; exhausting and deslagging are conducted, elementary gas is introduced into the smelted alloy melt, stirring is conducted, impurity gas in the melt is exhausted, and deslagging is conducted on the alloy melt; filtering is conducted, specifically, the alloy melt obtained after exhausting and deslagging is conveyed, and the alloy melt is filtered in an anti-blocking combined filtering mode; and casting is conducted, specifically, the filtered alloy melt is cast into the regenerated alloy bar, the problem that