A harmless disposal method for a cyanidation tailing, performed according to the following steps: (1) preparing the cyanidation tailing as a raw material, or adding an additive CaO to the cyanidation tailing as a mixed raw material; (2) heating the raw material or the mixed raw material to 250-450°C for pyrolysis and carrying out thermal insulation for less than or equal to 90 min so as to obtain calcine; and (3) directly using the calcine for backfill treatment, or extracting pyrite by means of flotation. The method has a good cyanogen removal effect, and the cyanidation tailing after undergoing low-temperature pyrolysis meets requirements of common solid wastes.
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