The invention discloses a manganese ore slag foamed rare earth ceramic profile and a preparation method thereof. The manganese ore slag foamed rare earth ceramic profile is prepared from, by weight, manganese ore slag powder and a rare earth formulation additive, and the ratio of the manganese ore slag powder to the rare earth formulation additive is (38-85):(15-35). The rare earth formulation additive is prepared from, by weight, solid waste material powder and rare earth powder, and the ratio of the solid waste material powder to the rare earth powder is (50-90):(10-60). Manganese ore slag is mainly adopted as a main raw material, and is smashed and milled, then rare earth elements are added according to a certain formulation, high-temperature roasting is carried out after casting, and various profiles including plates, columns, bars, pipes, edges and other building and decoration profiles of all types needed in the building industry are formed after hard processing and surface treatment. The manganese ore slag foamed rare earth ceramic profile and the preparation method thereof have the advantages that the use amount of the manganese ore slag is large, the technological process is simple, no secondary pollution exists, and resource utilization of the manganese ore slag is achieved; the rare earth elements are added, so that foamed ceramic is higher in strength, better in toughness, more even in bubble, thinner in bubble wall and smaller in weight.