The silicon carbide foam ceramic filter can effectively stabilize the metal liquid pouring process and inhibit the turbulence of molten metal. When the metal liquid flows through its unique three-dimensional three-dimensional mesh hole, the violent turbulence is effectively converted into a stable laminar flow. This laminar flow filling mode significantly improves the filling ability of metal liquid to complex casting cavity, which not only reduces the washing and erosion of the mold wall and sand core, but also helps to reduce the secondary oxidation and slag pinching caused by turbulence, thus significantly reducing the casting defect and scrap rate.