The invention discloses a high-rupture-strength baking-free brick. The high-rupture-strength baking-free brick is prepared from the raw materials including ordinary Portland cement 42.5, gravels, medium sand, nano calcium carbonate, mineral powder, nano silicon dioxide, nano aluminum oxide, coal cash, talcum powder, ferric chloride, magnesium chloride, magnesium oxide, modified carbon fiber, asbestos fiber, plant straw, sepiolite, polystyrene emulsion, polyvinyl acetate emulsion, polyphenyl emulsion, bentyl benzene emulsion, water reducer, accelerator, thickener, polyvinyl alcohol, dispersant, diffusant, water, silane coupling agent KH-570 and modified additives. The invention also discloses a preparation method of the high-rupture-strength baking-free brick. The prepared high-rupture-strength baking-free brick is excellent in rupture strength.