The invention provides a method for extracting regenerated carbon-containing fused magnesia from waste magnesia carbon bricks, which comprises the following steps: 1, removing impurities on the surface layers of the waste bricks; 2, placing the waste bricks in a kiln, heating the waste bricks by using external fuel to 800 to 1,000 DEG C, combusting graphite in the materials, blowing 80 to 180 mm of air, raising the temperature to 1350 to 1400 DEG C, and forming decarburized layers on the surfaces of the materials; 3, continuing to blow air for 30 to 90 minutes, cooling down to 600 to 650 DEG C, keeping the temperature for 300 to 600 minutes, and oxidizing bonding agent in the materials; 4, cooling, moving out of the kiln and removing the decarburized layers; and 5, crushing, rolling, screening and obtaining a final product. In the invention, according to a principle that phenolic resin is oxidized at above 460 DEG C and loses bonding strength, false particles are removed. The product burnt by the method has high purity and the same performance as original fused magnesia, and retains the graphite with high utilization value; and the graphite is coated on the outer layer of the fused magnesia, fills the air pores in the fused magnesia particles, improves the volume density (g / m<3>) of the particles, and improves anti- etching performance.