The invention discloses a method for quickly drying flue gas desulfurization gypsum. The method comprises the following steps: adding 1.0-2.0wt% of an additive into the flue gas desulfurization gypsum, uniformly stirring, and then naturally standing until the flue gas desulfurization gypsum reaches drying requirements. According to the method, industrial waste residue is used as the additive of raw materials, and conventional energy resources do not need to be consumed. The additive is made from industrial waste residues, does not consume conventional energy resources and is simple in production process; since the raw material is the industrial waste residue, resource utilization of the industrial waste residue is achieved, and energy resources are saved simultaneously. By utilizing the method, operation is simple and convenient, the purpose of dewatering can be achieved in natural state, the effect is good, the operation period is short, and the performance of a product can not be changed due to low mixing amount of the additive.