The invention discloses a curing reagent and method for chemically fixing pollutants in ardealite, and belongs to the technical field of solid waste treatment. The curing reagent comprises ammonium-containing solid waste, a magnesium component and a calcium-containing alkaline component. The curing reagent can efficiently fix pollutants such as hydrogen protons, phosphate radicals and fluorine ions in ardealite at the same time and can be solidified with ardealite to form a solidified body with high mechanical strength, the solidified body can be used as a roadbed material subsequently, and the curing reagent is mainly prepared from solid waste and is environment-friendly. The purposes of treating waste with waste and co-processing various solid wastes are achieved, and the environmental problem caused by solid waste stockpiling is avoided.