The invention provides cast ceramsites as well as a manufacture method and application thereof. In the method, bauxite clinker, kaolin and bauxite are used as raw materials; not only are the raw materials easy and convenient to obtain, but also a preparation process is simple, the energy consumption is low, the production efficiency is high and environmental protection treatment on production wastes is easy, so that the cost can be effectively reduced. At the same time, the cast ceramsites disclosed by the invention have high refractoriness, high strength, low thermal expansion coefficient and high repetitive utilization rate, not only meet the requirement of casting, but also can effectively reduce the casting cost.