The invention discloses anti-erosion magnesia-carbon bricks. The magnesia-carbon bricks are prepared from the following ingredients in parts by weight: 65-70 parts of magnesia, 3-5 parts of basalt granules, 0.25-0.5 part of nano zirconium boride, 1-3 parts of nickel citrate, 1-3 parts of copper sulfate pentahydrate, 0.3-0.5 part of hexamethylene tetramine, 15-18 parts of graphite, 3-5 parts of ceramic granules Al4SiC4 and 3-5 parts of binder. According to the anti-erosion magnesia-carbon bricks, the proportioning of the magnesia-carbon bricks is subjected to optimization and improvement, particularly, the basalt granules, the nano zirconium boride, the nickel citrate, the copper sulfate pentahydrate and the ceramic granules Al4SiC4 are added, and all the ingredients are synergistic mutually, so that the quality of the bricks is high, the carbon loss can be greatly lowered, the spalling of the bricks is avoided, the slag erosion resistance of the magnesia-carbon bricks is improved obviously, and the service lives of the magnesia-carbon bricks are prolonged. The invention further discloses a preparation method for the anti-erosion magnesia-carbon bricks. The preparation method is simple in processing steps and high in operability, has low requirements on equipment and is applicable to large-batch industrial production.