Belonging to the technical field of preparation of refractory materials for iron and steel metallurgy, the invention relates to a method for preparation of a high performance magnesia carbon brick byadding silicon carbide whisker. The specific preparation method includes: first, subjecting fused magnesia to screening treatment; then fully mixing the fused magnesia, graphite, phenolic resin, an additive and silicon carbide whisker of different granularities according to certain ratio, and conducting molding, standing and high temperature heat treatment to obtain a silicon carbide whisker improved magnesia carbon brick; and finally, detecting the compressive strength and oxidation resistance of the magnesia carbon brick. The method provided by the invention enhances the compressive strengthand oxidation resistance of the magnesia carbon brick, and reaches the quality requirements of steelmaking and continuous casting process for relevant refractory material components. The method has the advantages of simple and feasible process, cheap and easily available raw materials, and is easy to achieve mass production.