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This utility model relates to the field of turbocharger impeller casting technology, and discloses a vacuum casting device for turbocharger impellers. It includes a support base, a vacuum chamber mounted on the top of the support base, a maintenance door at the front end of the vacuum chamber, a maintenance door on one side of the top of a vacuum cover, a guide pipe mounted on the bottom of an intermediate ladle extending into the vacuum chamber, a material cylinder mounted on the top of the intermediate ladle, and a feed inlet on one side of the top of the material cylinder. This utility model incorporates components such as a filter cylinder, cover, connecting base, and mesh cylinder on one side of a vacuum pump. After the vacuum pump evacuates the vacuum chamber and restores it to normal, external gas entering the vacuum chamber is filtered through the mesh cylinder inside the filter cylinder to remove impurities, resulting in pure gas entering the vacuum chamber and improving performance.