The invention relates to the technical field of building decoration materials, and discloses an inorganic fireproof building decoration material which comprises a core layer, a filling layer and an inorganic fireproof layer. According to the inorganic fireproof building decoration material and the process thereof, the filling layer and the foamed concrete layer are formed by mixing the foaming agent, the cement, the fly ash, the stone powder and the water, so that the novel building energy-saving material which is light in weight, high in strength, non-absorbent and non-combustible is prepared by recycling waste. The building decoration material can be used for roof heat preservation and heat insulation, floor heating, ground cushion layer, inner partition wall and outer wall heat preservation and the like, so that the application range of the building decoration material is widened, finally, quartzite, waste silicon bricks, a mineralizing agent, a binding agent and an additive are mixed to form an inorganic fireproof layer, and waste recycling is adopted as well. The production cost of the building decoration material is further reduced, meanwhile, the blank firing shrinkage is reduced, the firing rejection rate of the building decoration material is reduced, and the effects of energy conservation, environmental protection and waste recycling are achieved.