The invention discloses steel ladle bottom castable. The steel ladle bottom castable comprises 15-25% of precast blocks, 40-50% of black aloxite, 5-10% of fused magnesium aluminate spinel, 5-15% of white corundum, 1-5% of sintered spinel, 0.5-1.5% of fibers, 5-10% of activated aluminium oxide micro-powder, 5-10% of a binder, 0.5-1% of a superplasticizer, 2-5% of silica powder, 0.01-0.05% of citricacid and 0.01-0.05% of metal aluminum powder, wherein the particle size of aggregate of the precast blocks is 8-35 mm, and the particle size of the metal aluminum powder is 60 meshes. According to the steel ladle bottom castable, the main raw material aggregate is the industrial by-product black aloxite, thus slag is reused, waste discharge is reduced, the production cost of the steel ladle bottom castable is reduced, moreover, in the steel ladle bottom castable, the content of the black aloxite is high, a thermal shock effect is good, the service life of a fire-resistant product is prolonged, a heat conductivity coefficient of the black aloxite is small, a heat insulation effect is good, a safety factor of a steel ladle is high, and the scouring resistance of the steel ladle bottom castable is improved, so that better use prospects are brought.