Molten aluminum filtering device

The utility model relates to a molten aluminum filtering device. The molten aluminum filtering device comprises a first filtering box and a filtering plate assembly. The first filter box is provided with a first filter chamber, and a first inlet and a first outlet which are communicated with the first filter chamber; the filter plate assembly is accommodated in the first filter chamber; the filter body comprises at least two sub-filter plates which are arranged at intervals in the first direction, and a first partition plate arranged between every two adjacent sub-filter plates; the first direction is the direction from the first inlet to the first outlet; the apertures of the filtering holes of any two adjacent sub-filtering plates are different; the filter plate assembly further comprises a first air communicating vessel extending in the second direction, and an included angle is formed between the second direction and the first direction. One end of the first gas communicating vessel is connected with the first partition plate, and the other end of the first gas communicating vessel is connected with the top wall of the first filtering chamber. Impurities in the molten aluminum filtered by the device are reduced, and the defect possibility that large-scale pinholes, foreign matters or bulges are formed on the surfaces of aluminum parts is reduced.