The invention relates to a novel gas-desulphurization and wastewater cyanide-degrading process and apparatus. The apparatus is characterized in that one end of a raw ammonia water pipeline is in logical connection with an outlet pipeline of raw ammonia water pump, and the other end of the raw ammonia water pipeline is in logical connection with the top of a desulfurization tower through an alkali washing section; the desulfurization tower is connected with an alkali tank, and the alkali tank is in logical connection with an alkali pump; one path of the outlet of the alkali pump is in logical connection with the inlet of the alkali washing section through a valve of the desulfurization tower, and another path of the outlet of the alkali pump is connected with a wastewater cooler through a steamed ammonia removing valve; and the wastewater cooler is in logic connection with an alkali regeneration tower, an ammonia water heat exchanger and an environment-friendly ammonia steaming wastewater removing pipeline. The novel gas-desulphurization and wastewater cyanide-degrading process and apparatus provided by the invention have the advantages of reduction in consumption of ferrous sulfate and decrease of cost for a cyanide-degrading agent.