The invention provides a method for preparing concrete from artificial quartzite slurry modified ardealite-based cementitious materials. The method includes drying and grinding ardealite, uniformly mixing the ardealite, cement and industrial byproducts such as slag powder and fly ash with one another to obtain mixtures, adding the mixtures into water and blending the mixtures and the water to obtain thick slurry; mixing silica fume with artificial quartzite slurry under high-speed stirring conditions, and activating the artificial quartzite slurry; sufficiently mixing and homogenizing the thick slurry and the artificial quartzite slurry with each other, then adding polymeric aluminum or other aluminum salt and high-performance polycarboxylic acid water reducing agents into the thick slurryand the artificial quartzite slurry, and uniformly stirring the polymeric aluminum or the other aluminum salt, the high-performance polycarboxylic acid water reducing agents, the thick slurry and theartificial quartzite slurry to obtain plastic cementitious materials with short coagulation time and high strength and ardealite dosage; blending the cementitious materials and gravel aggregate, andstirring the cementitious materials and the gravel aggregate to prepare the concrete. The silica fume is an industrial byproduct. The polymeric aluminum or the other aluminum salt is used as an admixture. The method has the advantages that the ardealite can be directly used after being dried and ground without earlier-stage purification and ageing treatment, accordingly, the production cycle can be shortened to a great extent, and the cost can be reduced; the concrete is high in industrial solid waste mixing amount, the optimal industrial solid waste mixing amount can reach 80%, in other words, 80% of the traditional silicate cement can be replaced, and the method has important significance in increasing the industrial solid waste comprehensive utilization rate and protecting environments.