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A casting coating sagging property tester comprises a base, a placing piece is arranged on the base, a sample is arranged on the placing piece, and a scraping piece is movably arranged on the placing piece. When the sagging property of the casting coating is tested, a standard sample pressing template is provided, the blade coating surface of the molding sand casting template is ensured to be flat and compact in a pressing and scraping manner before casting, and the molding sand casting template can be protected through the provided mold, so that the service life of the molding sand casting template is prolonged, and the service life of the molding sand casting template is prolonged. And the problem of slag falling or damage of the molding sand casting template in the blade coating process is avoided, so that the sagging property test is not influenced. Wherein the dropped molding sand slag is doped in the coating due to the occurrence of the slag dropping problem, so that the uniformity of the blade coating thickness of the casting coating is influenced.