The molten iron ladle lining material has long service in alternating environments with long intervals of high and low temperatures, which is very prone to peeling and corrosion damage. To explore the main factors affecting the service life of the molten iron ladle lining material, the chemical composition, phase composition, physical properties and microstructure of the four molten iron ladle Al2O3-SiC-C lining bricks on the market were analyzed. The corrosion mechanism of molten iron ladle Al2O3-SiC-C lining brick for stainless steel smelting was mainly studied by using blast furnace slag as a corrosion medium. The results show that the higher the content of Al2O3 in the molten iron ladle Al2O3-SiC-C lining brick, the lower the liquid phase content of the product at high temperature, which is more conducive to improving the high temperature mechanical properties of the refractory brick. With the increase of carbon content, the slag resistance of molten iron ladle Al2O3-SiC-C lining brick is improved, but the oxidation resistance and high temperature flexural strength show a downward trend. CaO and MgO in the furnace slag penetrate the refractory brick and react with Al2O3 and SiO2 in the refractory brick to form magnesium-aluminum spinel with high melting point and calcium feldspar with low melting point, etc., and the low melting phase will aggravate the corrosion of refractory bricks.