The invention belongs to the technical field of brick setting structures and discloses a high temperature resisting brick setting and a preparation method thereof to solve the problem that an existingbrick setting structure is low in high temperature resistance and is hard to use in high temperature resisting engineering. The high temperature resisting brick setting is composed of alkali slag neat paste and clay bricks. The alkali slag neat paste is formed by portioned preparation of granulated blast furnace slag, water glass, sodium hydroxide and water. The preparation method comprises the following steps that fine-ground blast furnace slag industrial waste is used as the main raw material, the blast furnace slag industrial waste is stimulated by appropriate alkaline activator and is stirred to form the alkali slag neat paste, and the alkali slag neat paste is used for building the clay bricks into brick settings to obtain the high temperature resisting brick settings. The preparation method is applied to preparation of brick setting in the high temperature resisting engineering.