Red mud-added ecological concrete and application of same in sewage purification

The invention provides a red mud-added ecological concrete which comprises a cementing material, aggregate, water and a naphthalene-based superplasticizer, wherein the cementing material includes red mud and slag portland cement. According to the invention, through application of the red mud in ecological concrete, a pollutant purifying effect of the ecological concrete can be improved, the waste is turned into the valuable at the same time, and the red mud can be used to replace cementing materials like cement; thus, production cost of the ecological concrete is substantially reduced, and the ecological concrete has good strength and considerable practical application values.