The invention relates to silicon carbide waste-doped dry-powder front mortar and a preparation method thereof. The dry-powder front mortar is prepared from the following components in parts by weight: 100 parts of Portland cement, 5 to 30 parts of silicon carbide waste, 250 to 400 parts of river sand, 1 to 5 parts of redispersible latex powder, 0.05 to 0.50 part of cellulose ether, and 0 to 0.80 part of fiber. Compared with the prior art, the dry-powder front mortar has the advantages that the silicon carbide waste is applied to the dry-powder front mortar, so that problems about the treatment of the silicon carbide waste are solved, the silicon carbide waste is resourcefully utilized, and the waste treatment cost of an enterprise is reduced; the strength of the dry-powder front mortar can be strengthened, the production cost of the dry-powder front mortar can be reduced, and the commercial popularization and application of the dry-powder front mortar are facilitated.