A method for applying red mud in industrial waste gases and wastewater treatment and green high performance functional materials co-processing, which relates to the technical field of environmental science and cementing material preparation, and in particular relates to a preparation process for a solid waste-based cementing material. The raw material is composed of 10-90 parts of red mud residue after sewage treatment, 20-60 parts of a cementing agent, 2-8 parts of an activator, and 1-5 parts of a toxic element curing agent. A preparation method for red mud residue after sewage treatment is as follows: after carbonizing by passing through industrial tail gas, red mud is prepared into a sewage treating agent, and after sewage is treated, red mud residue after sewage treatment is collected. The red mud residue after sewage treatment alongside other solid waste is prepared into a red mud-based functional building material by means of physicochemical activation and high-temperature calcination. The compressive strength of the prepared solid waste-based cementing material can reach 29 MPa, and the leaching amount of toxic elements, such as heavy metals, of same is less than 3.0 ppm, which is lower than the national regulatory requirement.
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