The invention discloses a castable for a bed surface of cremator. The castable is prepared from the following raw materials: electric-fused M70 mullite aggregate, aluminum 45 white flint clay aggregate, aluminum 45 white flint micropowder, Eken 95U silica fume, alumina micropowder, Suzhou white mud, electric-fused M70 mullite fine powder, aluminum 60 kyanite powder, Kerneos-Sica 71 cement, supplementary 2520 steel fiber, anti-burst fiber, BASF 2651F and Munzing P803. The castable disclosed by the invention is applied to a cremator trolley and is used for preparing a fire-resistant bed surface with a length of 2100mm-2200mm, a width of 680mm-780mm and a thickness of 120mm-150mm, and the fire-resistant bed surface is capable of resisting quick cooling and heating as well as liquid corrosion and fuel oil-fuel gas erosion caused during the cremating of a human body and has a long service life.