The invention discloses a method for manufacturing slagging pellets by using waste magnesia carbon brick hot end. The method is implemented by smashing waste magnesia carbon brick hot end to prepare waste magnesia carbon brick powder, taking 55-75 parts of waste magnesia carbon brick powder, 8-20 parts of light roasting magnesium oxide powder, 3-15 parts of graphite and 7-15 parts of bonding agent, adding water and mixing evenly, pressing for shaping, and drying to obtain carbon-containing magnesium oxide slagging pellets. The inventive slagging pellets has the characteristics of proper chemical composition, moderate strength, high activity and the like, the addition of the slagging pellets at later stage of blowing can reduce total iron content in the slag, enhance MgO content and is beneficial for obtaining a slag protective layer featuring easy slag adhering, high refractoriness and good splashed slag furnace protection effect; the invention adequately utilizes waste magnesia carbon brick hot end, realizes change waste material into things of value, and improves resource use ratio, thus being an environment-friendly production method; the inventive method is simple and convenient to implement, high in production efficiency and low in production cost.